Title of Invention: PAPER SHEET HANDLING APPARATUS Abstract: In order to display information for rejected paper sheets in an easily recognizable manner, the paper sheet handling apparatus includes: a transport path configured to transport paper sheets; a recognition unit configured to recognize the paper sheets transported in the transport path; a reject unit configured to stack rejected paper sheets discharged from the transport path based on a recognition result by the recognition unit; and a display unit configured to display information for rejected paper sheets in a manner which is different for a case where the number of the rejected paper sheets stacked in the reject unit can be determined, and for a case where the number of the rejected paper sheets stacked in the reject unit cannot be determined. Detailed Description: CROSS-REFERENCE TO RELATED APPLICATIONS This is a Continuation of U.S. patent application Ser. No. 15/911,456 filed on Mar. 5, 2018, which is a Continuation of U.S. patent application Ser. No. 15/506,394 filed on Feb. 24, 2017, which was the National Stage of International Application No. PCT/JP2015/074005 filed on Aug. 26, 2015, which claimed the benefit of priority from the Japanese Patent Application No. 762-668-8379 filed on Aug. 27, 2014, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present invention relates to a paper sheet handling apparatus that recognizes kinds of paper sheets, and stacks the paper sheets in stacking units according to the recognition results. BACKGROUND ART To date, in financial facilities such as banks, paper sheet handling apparatuses that handle paper sheets such as banknotes and checks have been used. For example, a banknote handling apparatus is used to perform authentication of banknotes, or count the number of banknotes or the monetary amount of the banknotes. A small banknote handling apparatus that can be used at a teller window by a person (teller) in charge of the teller window is disclosed in Patent Literature 1. The banknote handling apparatus has a function of feeding banknotes placed in a hopper, one by one, into the apparatus, performing recognition of denominations of the banknotes and authentication of the banknotes, and counting the banknotes. The banknote handling apparatus includes, in addition to the hopper, four stacking units in which the recognized and counted banknotes are stacked, and a reject unit into which rejected notes such as counterfeit notes, and banknotes for which denominations or authenticity cannot be recognized, are discharged. The banknotes in the hopper are transported into the stacking units or the reject unit according to the recognition results. For example, banknotes received from a customer at a teller window are handled by the banknote handling apparatus, whereby results of authentication of the banknotes, and results of the handling such as the number of banknotes per denomination or the total monetary amount of the banknotes, can be obtained. Therefore, the burden of the task on a teller can be reduced. Further, banknotes are recognized and counted by the banknote handling apparatus, whereby human error in authentication or calculating the monetary value can be prevented. In the banknote handling apparatus disclosed in Patent Literature 1, information about handled banknotes is displayed on a screen of a banknote management apparatus. For example, various information such as a denomination and the number of banknotes that are stacked in each of the four stacking units, as well as the total number of deposited banknotes and the total monetary amount thereof, are displayed in a depositing step. CITATION LIST Patent Literature [PTL 1] Japanese Patent No. 5313257 SUMMARY OF THE INVENTION Problems to be Solved by the Invention However, the above conventional art has a problem that information for paper sheets that are rejected into the reject unit is not displayed. For example, in a case where a teller who receives 100 banknotes from a customer at the teller window uses the conventional banknote handling apparatus to perform recognition and counting of the banknotes, if five banknotes among the 100 banknotes are stacked as rejected notes in the reject unit, display on the display unit merely represents 95 banknotes, and information for the five rejected notes is not displayed. Therefore, in a case where, although 100 banknotes have been delivered to the teller, the display represents 95 banknotes, the customer may feel anxious or the teller may not find that the rejection of notes has occurred and be confused during the handling in some cases. The rejected notes include not only a rejected note which can be determined as one banknote, such as a banknote for which a denomination or authenticity cannot be recognized or a banknote recognized as a counterfeit note, but also rejected notes for which the number of banknotes cannot be determined due to, for example, overlapping or chaining in which a plurality of banknotes are transported in a state where the entirety or some of the plurality of banknotes overlap each other. In a case where such rejected notes for which the number of banknotes cannot be determined occurs, a problem associated with how information for the rejected notes is to be displayed, arises. The present invention is made in order to solve the aforementioned problem of the conventional art, and an object of the present invention is to provide a paper sheet handling apparatus which displays information for rejected paper sheets in an easily recognizable manner. Solution to the Problems In order to solve the aforementioned problem and attain the object, the present invention is directed to a paper sheet handling apparatus that includes: a transport path configured to transport paper sheets; a recognition unit configured to recognize the paper sheets transported in the transport path; a reject unit configured to stack rejected paper sheets discharged from the transport path based on a recognition result by the recognition unit; and a display unit configured to display information for rejected paper sheets in a manner which is different for a case where the number of the rejected paper sheets stacked in the reject unit can be determined and for a case where the number of the rejected paper sheets stacked in the reject unit cannot be determined. Further, according to the present invention, the display unit: displays the total number of the rejected paper sheets stacked in the reject unit while the number of the rejected paper sheets stacked in the reject unit can be determined. the display unit: displays, as the number of times rejection has occurred, a value obtained by adding the total number of rejected paper sheets for which the number of paper sheets has been determined, and the number of times rejection has occurred in a state where the number of rejected paper sheets cannot be determined, instead of the total number of rejected paper sheets for which the number of paper sheets has been determined, being displayed, in a case where rejection has occurred in a state where the number of rejected paper sheets cannot be determined, and the number of rejected paper sheets stacked in the reject unit cannot be determined. Further, according to the present invention, the display unit: displays the total number of the rejected paper sheets stacked in the reject unit while the number of the rejected paper sheets stacked in the reject unit can be determined. the display unit: displays, as the number of times rejection has occurred, the number of times rejection has occurred in a state where the number of rejected paper sheets cannot be determined, in addition to the total number of rejected paper sheets for which the number of paper sheets has been determined, being displayed, in a case where rejection has occurred in a state where the number of rejected paper sheets cannot be determined, and the number of rejected paper sheets stacked in the reject unit cannot be determined. Further, according to the present invention, when the number of times rejection has occurred in a state where the number of rejected paper sheets cannot be determined is displayed as the number of times rejection has occurred, the number of times rejection has occurred is displayed according to respective reject reasons. Further, according to the present invention, a numerical value representing the number of times rejection has occurred is displayed together with information indicating that the numerical value represents the number of times rejection has occurred in a state where the number of rejected paper sheets cannot be determined. Further, according to the present invention, the total number of rejected paper sheets and the number of times rejection has occurred are displayed in different colors, respectively. Further, according to the present invention, a case where the number of rejected paper sheets cannot be determined is a case where a paper sheet transported in the transport path is in at least one of: an overlapping state; a chaining state; an abnormal thickness state; and an abnormal size state. Advantageous Effects of the Invention According to the present invention, information about a paper sheet that is rejected into the reject unit can be displayed on a screen of the display unit. The information is displayed on the screen in a manner which is different for a case where the number of rejected paper sheets can be determined and for a case where the number of rejected paper sheets cannot be determined, whereby contents of the displayed information can be easily recognized. For example, a numerical value representing the number of rejected paper sheets is displayed while the number of rejected paper sheets can be determined, and the number of rejections representing the number of times rejection has occurred is displayed together with a predetermined mark or in parentheses after determination of the number of rejected paper sheets has become impossible. Thus, it can be easily known whether the displayed information represents the number of rejected paper sheets for which the number of paper sheets has been determined, or the displayed information represents the number of times rejection has occurred since the number of paper sheets cannot be determined. Further, according to the present invention, the number of rejected paper sheets for which the number of paper sheets has been determined and the number of rejections representing the number of times rejection has occurred in a state where the number of rejected paper sheets cannot be determined can be separately displayed after determination of the number of rejected paper sheets has become impossible. By the number of rejected paper sheets being displayed, an operator of the paper sheet handling apparatus can know the total number of handled paper sheets according to the number of paper sheets stacked in the stacking unit, and the number of rejected paper sheets. Further, although the number of times rejection has occurred does not represent the number of rejected paper sheets, in a case where the number of times rejection has occurred is displayed, the operator of the paper sheet handling apparatus can easily know that rejection of a paper sheet has occurred. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an external appearance of a banknote handling apparatus according to an embodiment. FIG. 2 is a plan view of an external appearance of the banknote handling apparatus. FIG. 3 illustrates an opening and closing operation of an upper unit and a rear unit. FIG. 4 illustrates a structure of a reject unit. FIG. 5 illustrates a positional relationship between two banknote stacking units and an operation display unit on the apparatus front surface. FIG. 6 is a schematic cross-sectional view illustrating a schematic internal structure of the banknote handling apparatus. FIG. 7 is a schematic cross-sectional view illustrating an opening and closing operation of a recognition unit. FIG. 8 is a schematic cross-sectional view illustrating an opening and closing operation of the upper unit. FIG. 9 illustrates a structure of a dust receiver unit. FIG. 10 illustrates a structure of the banknote stacking unit. FIG. 11 is a schematic diagram illustrating a structure of a transport path. FIG. 12 is a perspective view illustrating a structure of a pushing member disposed in the banknote stacking unit, and a driving mechanism for moving the pushing member. FIG. 13 illustrates a method for moving the pushing member by a pushing mechanism. FIG. 14 is a schematic diagram illustrating a retracted position and a pushed position of the pushing member in the banknote stacking unit. FIG. 15 is a perspective view illustrating stacked-banknote detection sensors for detecting presence or absence of banknotes stacked in the banknote stacking unit, and sensor brushes for cleaning the sensors. FIG. 16 illustrates a method for performing cleaning by the sensor brushes. FIG. 17 illustrates positions at which the stacked-banknote detection sensors are positioned relative to the banknote stacking unit. FIG. 18 is a development illustrating a structure of a banknote transport path in the banknote handling apparatus. FIG. 19 is a schematic diagram illustrating a position where a stacking wheel is positioned in the banknote stacking unit. FIG. 20 illustrates an example of a screen displayed on the operation display unit during handling of banknotes. FIG. 21 illustrates an example of a screen displayed on the operation display unit when a rejected note occurs during handling of banknotes. FIG. 22 illustrates an example of a screen displayed on the operation display unit when restoration is performed in a case where an error occurs during handling of banknotes. FIG. 23 illustrates priority setting for a plurality of banknote stacking units disposed in the banknote handling apparatus. FIG. 24 is an external view illustrating an example of a banknote handling apparatus that includes multiple banknote stacking units. FIG. 25 is a schematic diagram illustrating a method for setting kinds of banknotes to be stacked in banknote stacking units, respectively. DESCRIPTION OF EMBODIMENTS A paper sheet handling apparatus according to the present invention will be described below with reference to the accompanying drawings. Although the paper sheet handling apparatus according to the present invention is capable of handling paper sheets such as banknotes, checks, and gift coupons, a banknote handling apparatus that handles banknotes will be described below as an example. [External Structure of Apparatus] FIG. 1 is a perspective view of an external appearance of a banknote handling apparatus 1. The banknote handling apparatus 1 which has a hopper 20 and a reject unit 50 on a side surface, and two banknote stacking units 30, 40 on the front surface, has a characteristic that the size of the apparatus is reduced by banknotes being stacked so as to be tilted in a standing state in the banknote stacking units 30, 40 each having an opening through which the banknotes are taken out, and by the protrusion of the reject unit 50 from the apparatus side surface being minimized to reduce the lateral width of the apparatus. In the present embodiment, among four side surfaces of the apparatus, the apparatus front side surface on which an operation display unit 70 is disposed is referred to as the front surface, the side surface on the right side and the side surface on the left side as viewed from an operator who operates the operation display unit 70 on the front surface side of the banknote handling apparatus 1 are referred to as the right side surface and the left side surface, respectively, and the surface on the rear side is referred to as the rear surface. Further, in the present embodiment, as shown in FIG. 1, a direction from the apparatus left side surface toward the right side surface is defined as the X-axis direction, a direction from the apparatus front surface toward the rear surface is defined as the Y- axis direction, and a direction from the apparatus bottom surface toward the upper surface is defined as the Z-axis direction. An upper unit 11 and a lower unit 12 are included on the front surface side of the banknote handling apparatus 1. The banknote handling apparatus 1 is a small apparatus that can be mounted in a space in which the lateral width (in the X-axis direction) is 450 mm, the depth (in the Y-axis direction) is 450 mm, and the height (in the Z-axis direction) is 400 mm. A part of the reject unit 50 protrudes on the right side surface, whereby the lateral width of an installation surface is further reduced to be less than or equal to 400 mm. In the lower left and right end portions of the front surface of the banknote handling apparatus 1, recesses 36, 46 are provided so as to form gaps into which hands are placed between a desk and an apparatus housing in a case where, for example, the banknote handling apparatus 1 is installed on the desk. Recesses 36, 46 are formed also on the apparatus rear surface side. Hands can be placed in the recesses 36, 46 at the four corners on the bottom surface, whereby the banknote handling apparatus 1 can be carried. At almost the center of the front surface of the upper unit 11, a large operation display unit 70 that allows input operation of various kinds of information and output display of various kinds of information, is disposed. In the operation display unit 70, the upper side is disposed at almost the same position as the apparatus front surface, whereas the lower side protrudes forward from the apparatus front surface, and the operation display unit 70 is fixed so as to be tilted upward such that an operator can easily view the displayed contents. A push-to-open type dust tray 71 is disposed in a portion leftward of the operation display unit 70, and is ejected from the front surface side by pushing the tray toward the rear surface side. Dust such as paper powder generated while banknotes are transported in the apparatus is collected into the dust tray 71, and the dust tray 71 can be taken out from the apparatus. On the right side surface of the upper unit 11, the hopper 20 in which banknotes to be recognized and counted are placed, is provided. Below the hopper 20, the reject unit 50 into which rejected notes are discharged, is disposed. In the reject unit 50, the upper surface of a stacking space in which the rejected notes are stacked is in the upper unit 11, and the bottom surface thereof is in the lower unit 12. On the upper surface of the upper unit 11, an openable and closable upper lid 13 is disposed. An engagement member is disposed between the upper lid 13 and the upper unit 11, and the upper lid 13 and the upper unit 11 are usually fixed by the engagement member. As shown in FIG. 1, a lever for disengaging the engagement by the engagement member is disposed at almost the center position in the front-rear direction on the right side of the upper lid 13. When an operation of opening the upper lid 13 upward in a state where a finger is placed on the lever, is performed, an operation of disengaging the engagement by the engagement member and an operation of opening the upper lid 13 having been disengaged can be performed as a series of operation. By opening the upper lid 13, the recognition unit and the transport path in the upper unit 11 are exposed to allow inspection, maintenance, or the like to be performed. In the hopper 20, banknotes can be placed in a stacked state such that the short edges of the banknotes face toward the front surface side (in the Y-axis negative direction), and the long edges of the banknotes face forward in the transporting direction (in the X-axis negative direction). The banknotes stacked on a stage of the hopper 20 are fed one by one into the transport path in the apparatus in order starting from the lowermost banknote. The banknotes in the transport path are transported in a state where the long edge of each banknote faces forward in the transporting direction. The hopper 20 includes guide members 21 that support the banknotes placed in a stacked state, from the short edge sides (in the Y-axis direction). The guide members 21 are formed of a transparent resin, and the banknotes placed in the hopper 20 can be checked from the outside. The two guide members 21 having shapes which are symmetrical with respect to the XZ plane can cooperate to slide in the Y-axis direction. Positions of the two guide members 21 are adjusted according to the length of the long edges of the banknotes, whereby the banknotes can be placed at almost the center of the hopper 20 in the front-rear direction (the Y-axis direction) and fed into almost the center portion, in the width direction (the Y-axis direction), of the transport path. The stage on which the banknotes are placed in the hopper 20 is shaped such that almost the center portion in the front-rear direction (the Y-axis direction) is recessed leftward (in the X-axis negative direction). Through the recess, the stacking space of the reject unit 50 below the hopper 20 can be seen (see (B) of FIG. 2). After all the banknotes on the stage are fed into the apparatus, whether or not a rejected note discharged into the reject unit 50 is present can be easily checked. As shown in FIG. 1, the reject unit 50 includes: two stopper members 52 that stop a rejected note discharged from the transport path of the apparatus into the stacking space of the reject unit 50 so as not to eject the rejected note to the outside; and a holder member 53 that holds, from the upper side, the rejected note that have stopped in the stacking space. The stopper members 52 are maintained at a normal position shown in FIG. 1 by a spring member, and are also supported so as to be pivotable, about the Y axis, outward of the apparatus. When the rejected notes stacked in the reject unit 50 are taken out from the apparatus right side, the stopper members 52 pivot clockwise, to allow the rejected notes to be easily taken out. At the lower right portion on the front surface of the upper unit 11, a recess 51 is formed so as to be recessed from the housing front surface toward the rear surface. Further, a side wall that supports the rejected notes in the stacking space of the reject unit 50 from the short edge side is shaped such that the right side portion of the side wall on the front surface side is cut leftward. By the cutting of the side wall, the stacking space of the reject unit 50 and the space of the recess 51 connect with each other in a portion inward of the housing outer side surface. The space of the recess 51 on the housing front surface is connected with the stacking space of the reject unit 50 disposed on the right side surface, whereby an operator of the banknote handling apparatus 1 is allowed to easily check whether or not rejected notes are in the reject unit 50, and to easily take out the rejected notes from the reject unit 50 when the operator is on the apparatus front surface side. In the recess 51, a lever for disengaging engagement by the engagement member by which the upper unit 11 and the lower unit 12 are engaged with each other is disposed at a diagonally upper left position. The lever is disposed at a position where a finger can be placed on the lever when a right hand is inserted into the recess 51 so as to raise the right side surface portion of the upper unit 11 upward. Thus, an operation of opening the upper unit 11 upward in a state where a hand is inserted into the recess 51 and a finger is placed on the lever, is performed, whereby an operation of disengaging the engagement by the engagement member and an operation of opening the upper unit 11 having been disengaged can be performed as a series of operation. The two banknote stacking units 30 and 40 each having an opening on the front surface side are disposed on both the left and the right outer sides of the lower unit 12. The banknotes fed from the hopper 20 into the apparatus are recognized and counted by the recognition unit in the apparatus. Banknotes which are recognized to be stacked in the banknote stacking unit 30 or 40 are stacked in the first banknote stacking unit 30 or the second banknote stacking unit 40 according to the recognition result. The banknotes discharged into the banknote stacking unit from the upper right portion in the first banknote stacking unit 30 are transported toward a left side wall in the banknote stacking unit by a stacking wheel 33 that rotates about the Y axis counterclockwise. The left side wall is tilted such that the upper portion thereof is on the left side and the lower portion thereof is on the right side. The banknotes transported toward the left side wall by the stacking wheel 33 are stacked such that the banknote face is parallel to the wall surface of the tilted left side wall, and the banknotes are stacked so as to be tilted in a standing state. Similarly, the banknotes discharged into the banknote stacking unit from the upper left portion in the second banknote stacking unit 40 are transported toward a right side wall in the banknote stacking unit by a stacking wheel 43 that rotates about the Y axis clockwise. The right side wall is tilted such that the upper portion thereof is on the right side, and the lower portion thereof is on the left side. The banknotes transported toward the right side wall by the stacking wheel 43 are stacked such that the banknote face is parallel to the wall surface of the tilted right side wall, and the banknotes are stacked so as to be tilted in a standing state. That is, the banknotes are stacked in the stacking space of the banknote stacking unit, in a state where the short edge faces forward and the long edge contacts with the bottom surface, so as to be tilted in a standing state such that the upper side portion of the short edge is closer to the outer side of the apparatus than the lower side portion of the short edge is. The stacking wheels 33, 43 are stacking wheels that rotate for stacking banknotes in an aligned state in the stacking spaces of the first banknote stacking unit 30 and the second banknote stacking unit 40. The banknote handling apparatus 1 has the two banknote stacking units 30, 40 on the left and the right sides, and stacks banknotes in each of the banknote stacking units such that the banknotes are tilted in a standing state. Thus, the lateral width of the stacking space necessary for stacking the banknotes is reduced as compared to a case where the banknotes are stacked in a state where the banknote face is horizontally oriented. On the front side of the left side surface of the lower unit 12, a cut portion 31 (cut-away portion 31) is formed by the left side surface being cut from the front surface side toward the rear surface side so as to be curved. Similarly, also on the front side of the right side surface of the lower unit 12, a cut portion 41 (cut-away portion 41) is formed by the right side surface being cut from the front surface side toward the rear surface side so as to be curved. Further, on the front surface of the lower unit 12, a recess 60 is formed between the left and the right banknote stacking units 30 and 40 so as to be recessed toward the rear surface side. The front end of the left side wall which forms the stacking space of the first banknote stacking unit 30 is closer to the rear surface side than the cut portion 31 of the housing left side surface is, and the cut portion 31 and the front end of the left side wall of the stacking space are connected through an opening left side surface 35. Further, the front end of the right side wall which forms the stacking space of the first banknote stacking unit 30 is closer to the rear surface side than the recess 60 formed between the first banknote stacking unit 30 and the second banknote stacking unit 40 is, and is closer to the front surface side than the stacking wheel 33 is. The recess 60 and the front end of the right side wall of the stacking space are connected through an opening right side surface 32. Similarly, the front end of the right side wall which forms the stacking space of the second banknote stacking unit 40 and the cut portion 41 are connected through an opening right side surface 45. Further, the front end of the left side wall which forms the stacking space of the second banknote stacking unit 40 and the recess 60 are connected through an opening left side surface 42. An operator who is on the front surface side is allowed to visually check, with ease, whether or not banknotes are stacked in the first banknote stacking unit 30 and the second banknote stacking unit 40, by the recess 60 and the left and the right opening side surfaces 32, 42 on the front surface of the lower unit 12. Further, in the first banknote stacking unit 30, by: the cut portion 31 on the housing left side surface, and the opening left side surface 35 connecting from the cut portion 31 to the left side wall of the stacking space; and the opening right side surface 32 connecting from the right side wall of the stacking space to the recess 60, the banknotes stacked so as to be tilted along the left side wall of the stacking space in a standing state can be easily held from the left and the right sides and taken out. Similarly, also in the second banknote stacking unit 40, by: the cut portion 41 on the housing right side surface, and the opening right side surface 45 connecting from the cut portion 41 to the right side wall of the stacking space; and the opening left side surface 42 connecting from the left side wall of the stacking space to the recess 60, the banknotes stacked so as to be tilted along the right side wall of the stacking space in a standing state, can be easily taken out. In the first banknote stacking unit 30 and the second banknote stacking unit 40, the cut portions 31, 41 are formed on the side surfaces, and the bottom surfaces continuously extend to the housing front surface of the apparatus. Therefore, the banknotes can be stably stacked so as to be tilted in a standing state such that the long edge portions are along the bottom surface. The opening right side surface 32 and the opening left side surface 35 formed at the opening of the first banknote stacking unit 30 are each formed as a curved surface that is tilted so as to reduce the opening area toward the stacking space. However, the tilted curved surfaces may be removed and the front ends of the left and right side walls of the stacking space may be exposed. Similarly, the opening left side surface 42 and the opening right side surface 45 formed at the opening of the second banknote stacking unit 40 are each formed as a curved surface that is tilted so as to reduce the opening area toward the stacking space. However, also for these, the front ends of the left and right side walls of the stacking space may be exposed. Thus, in the banknote handling apparatus 1, the cut portions 31, 41 on the left and right side surfaces of the housing of the lower unit 12, the recess 60 formed between the first banknote stacking unit 30 and the second banknote stacking unit 40, the tilted opening side surfaces 32, 35 of the first banknote stacking unit 30, and the tilted opening side surfaces 42, 45 of the second banknote stacking unit 40, are formed. Thus, whether or not banknotes are stacked in the stacking space of each of the first banknote stacking unit 30 and the second banknote stacking unit 40, can be easily checked from the apparatus right side. Further, similarly, whether or not banknotes are stacked in the first banknote stacking unit 30 and the second banknote stacking unit 40, can be easily checked also from the apparatus left side. For example, at a counter of a teller window of a bank, the banknote handling apparatus 1 is installed such that the apparatus right side surface that includes the hopper 20 and the reject unit 50 faces toward a customer outside the teller window. A teller operates the banknote handling apparatus 1 from the apparatus front surface side. At this time, the customer can see a state where banknotes delivered to the teller are placed in the hopper 20 and fed one by one into the apparatus, or a state where rejected notes are discharged into the reject unit 50. Further, in a case where the lower unit 12 has the cut portions 31, 41, the recess 60, and the opening side surfaces 32, 35, 42, 45, a customer who is on the right side of the apparatus so as to oppose a teller, can see a state where banknotes are stacked in the first banknote stacking unit 30 and the second banknote stacking unit 40. Thus, the banknote handling apparatus 1 is disposed so as to allow a customer to easily see the hopper 20, the first banknote stacking unit 30, the second banknote stacking unit 40, and the reject unit 50, and a teller handles, in front of the customer, the banknotes received from the customer, thereby avoiding doubt about an operation, by the teller, for handling the banknotes and banknote handling by the banknote handling apparatus 1. [Position at which Ports and the Like are Arranged] FIG. 2 is a plan view of an external appearance of the banknote handling apparatus 1. FIG. 2(A) illustrates the front surface of the banknote handling apparatus 1, FIG. 2(B) illustrates the upper surface thereof, FIG. 2(C) illustrates the right side surface thereof, and FIG. 2(D) illustrates the left side surface thereof. FIG. 2(B) illustrates an exemplary case where the banknote handling apparatus 1 is installed at a place where two side surfaces thereof face wall surfaces such that the rear surface and the left side surface face the wall surfaces. The cross sections of the wall surfaces as viewed from above the upper surface are indicated by diagonal lines. The banknote handling apparatus 1 has a characteristic that a slot into which a memory card that is a portable storage medium is inserted, ports for connection of a USB cable and a LAN cable, an inlet for connection of a power supply cable, and the like, are disposed collectively on the rear side of the right side surface on which the hopper 20 and the reject unit 50 are disposed, whereby the banknote handling apparatus 1 can be installed without a gap between: the apparatus left side surface and the apparatus rear surface; and the wall surfaces, as shown in FIG. 2(B). As shown in FIG. 2(C), the upper unit 11 and the lower unit 12 are disposed on the apparatus front side, and a rear unit 14 in which upper and lower portions are integrated with each other is disposed on the rear side. That is, the housing of the banknote handling apparatus 1 includes three units which are the upper unit 11 on the front side, the lower unit 12 on the front side, and the rear unit 14 on the rear side. In the banknote handling apparatus 1, as shown in FIG. 2(C), a memory card slot 62, a USB port 63, a LAN port 64, a dedicated port 65 for connection of a dedicated external device such as a printer, a main power supply switch 66, and a power supply inlet 67 are provided on the right side surface of the rear unit 14 so as to be aligned in line in the vertical direction. That is, the ports and the like are disposed collectively in a vertically elongated partial region on the rear side of the housing right side surface. The power supply inlet 67 to which a power supply cable is connected when the banknote handling apparatus 1 is used, is disposed at the lowermost position. Further, above the power supply inlet 67, the LAN port 64 to which a LAN cable may be connected, and the dedicated port 65 to which a cable for connection of an external device may be connected, are disposed. Further, above the ports 64, 65, the USB port 63 to which a USB cable may be connected is disposed. The memory card slot 62 to which a cable or the like is not connected, is disposed at the uppermost position. Thus, the more likely a port is to be a port to which a cable or the like is connected, the lower a position at which the port is disposed. Thus, connection of a cable or the like to each port, and insertion of a portable storage medium such as a memory card or a USB memory, can be facilitated. The memory card slot 62 allows insertion thereinto of a memory card in which, for example, new template data for banknote recognition, or new firmware for updating a function of the banknote handling apparatus 1, is stored, and is used for updating the template data for recognition, the firmware, or the like. Further, in a memory card inserted into the memory card slot 62, data for handling of banknotes, or log data for, for example, recording of operation of each component in the banknote handling apparatus 1, can be stored. Further, the USB port 63 can be used for, for example, updating template data for recognition, updating firmware, or recording log data by using a USB memory. Further, the USB port 63 is used for connection of a USB cable when a device capable of performing data communication using the USB cable is connected. The LAN port 64 is used for connecting the banknote handling apparatus 1 to a network via a LAN cable. By the banknote handling apparatus 1 being connected to a network, data communication with an external device such as a higher-ranking terminal or a management server can be performed, or the banknote handling apparatus 1 can be controlled from an external device. Further, for example, updating of template data for recognition for the banknote handling apparatus 1, updating of firmware therefor, or collecting log data therefor, can be performed via a network from another device such as a higher-ranking terminal. The dedicated port 65 is an interface for connection of a dedicated device such as a printer or a display device. The power supply inlet 67 is a port for connection of a power supply cable for supplying power to the banknote handling apparatus 1. The main power supply switch 66 is a switch for controlling ON and OFF of power supplied through the power supply cable. As shown in FIG. 2(C), an auxiliary power supply switch 61 is provided on the right side surface of the lower unit 12 of the banknote handling apparatus 1, and both the main power supply switch 66 and the auxiliary power supply switch 61 are made ON, whereby the banknote handling apparatus 1 is actuated. In a state where the main power supply switch 66 is OFF, even if the auxiliary power supply switch 61 is ON, the banknote handling apparatus 1 cannot perform banknote handling. In a state where the main power supply switch 66 is ON and the auxiliary power supply switch 61 is OFF, the apparatus is in a standby state. On the right side surface, of the banknote handling apparatus 1, on which the hopper 20 and the reject unit 50 are disposed, banknotes need to be placed in the hopper 20, and banknotes need to be taken out from the reject unit 50. Therefore, in general, the banknote handling apparatus 1 cannot be installed so as to bring the right side surface into close contact with a wall surface. Similarly, on the front surface in which the opening of each of the first banknote stacking unit 30 and the second banknote stacking unit 40 is formed, banknotes stacked thereinside need to be taken out. Therefore, in general, the banknote handling apparatus 1 cannot be installed so as to bring the front surface into close contact with a wall surface. In the banknote handling apparatus 1, the ports and the like are disposed on a surface, of the housing, which cannot be usually positioned so as to face a wall surface. Specifically, all of the memory card slot 62, the USB port 63, the LAN port 64, the dedicated port 65 for connection of an external device, the main power supply switch 66, and the power supply inlet 67 are disposed collectively on the right side surface which cannot be positioned so as to oppose a wall surface since a state of handling of banknotes is shown to a customer when the banknotes are handled. Thus, the left side surface and the rear surface on which ports and the like are not disposed, can be disposed so as to nearly contact with wall surfaces as shown in FIG. 2(B), whereby an unnecessary space may not be formed between the wall surface and the apparatus when the apparatus is installed. Further, also in a case where the banknote handling apparatus 1 is installed as shown in FIG. 2(B), the right side surface on which the ports and the like are disposed, is open, whereby the ports and the like can be used without moving the banknote handling apparatus 1. FIG. 3 illustrates a state where the upper unit 11, the lower unit 12, and the rear unit 14 are opened and closed. The engagement member is disposed between the upper unit 11 and the lower unit 12, and the upper unit 11 and the lower unit 12 are usually fixed by the engagement member. In the banknote handling apparatus 1, the engagement member is unlocked, whereby, as shown in FIG. 3(A), the right side portion of the upper unit 11 can be opened upward relative to the lower unit 12. Further, the right side portion, of the rear unit 14, in which the ports and the like are collectively disposed as shown in FIG. 2(C), can be opened rearward relative to the upper unit 11 and the lower unit 12, as shown in FIG. 3(B). By the upper unit 11 being opened upward, for example, in a case where a banknote is jammed in the transport path in the apparatus, during handling of banknotes, due to occurrence of an error such as jamming of a banknote (jamming), the jammed banknote can be removed from the transport path, or inspection or repair of each component of the apparatus can be performed. In the rear unit 14, a substrate to which the memory card slot 62, the USB port 63, the LAN port 64, the dedicated port 65 for an external device, the main power supply switch 66, the power supply inlet 67, and the like are connected, a power supply unit, and the like are accommodated. Further, substrates for, for example, controlling the recognition unit that performs recognition of denominations of banknotes and the like in the banknote handling apparatus 1, controlling transporting of banknotes in the transport path are also accommodated in the rear unit 14. For example, in a case where the banknote handling apparatus 1 installed as shown in FIG. 2(B) is out of order, the banknote handling apparatus 1 is moved forward, and the rear unit 14 is opened rearward, whereby, for example, a motor for driving rollers in the transport paths in the upper unit 11 and the lower unit 12 can be inspected. [Structure of Reject Unit] FIG. 4 illustrates structures of the reject unit 50, and the housing recess 51 formed on the apparatus front surface side of the reject unit 50. FIG. 4(A) is a perspective view of an external appearance of the reject unit 50, and FIG. 4(B) is a plan view of the reject unit 50 as viewed from thereabove. The banknote handling apparatus 1 has a characteristic that the right side portion of a side wall 11a on the front surface side of the reject unit 50 is cut, and the recess 51 is formed on the housing front surface so as to connect with the stacking space of the reject unit 50 via a cut portion 51a (cut-away portion 51a). The recess 51 is recessed from a front surface 11b of the upper unit 11 toward the rear surface side, and the recess 51 and the stacking space of the reject unit 50 are connected with each other via the cut portion 51a, of the side wall 11a, formed so as to be continuous with a front surface 51b of the recess 51. By such a structure, rejected notes can be easily taken out also from the apparatus front surface side. As shown in FIG. 4(A), a corner portion 15a, on the right side of the short edge, of rejected notes 15 stacked in the reject unit 50 protrudes from the stacking surface of the reject unit 50 in the front-right direction. The rejected notes 15 can be taken out by nipping and holding the corner portion 15a from the upper and the lower sides. A lever 51c for opening the upper unit 11 is disposed in the recess 51. By gripping the lever 51c so as to lift the lever 51c upward, the engagement between the upper unit 11 and the lower unit 12 by the engagement member is disengaged. By further lifting the lever 51c upward, the upper unit 11 having been disengaged, is lifted upward, whereby opening can be performed as shown in FIG. 3(A). As shown in FIG. 4(B), in the stacking space of the reject unit 50, the rejected notes 15 are stacked as indicated by dashed lines. On the stacking surface on which the rejected notes 15 are stacked, a stacking surface 50b between the two stopper members 52 is positioned so as to be cut in the leftward direction (the X-axis negative direction) of the apparatus, and the rejected notes 15 can be taken out by nipping and holding the rejected notes 15 from the upper side and the lower side in the cut portion. A rear surface side stacking surface 50c of the reject unit 50 is positioned so as to be cut up to the same position as the stacking surface 50b between the stopper members 52 in the leftward direction (the X-axis negative direction) of the apparatus. Meanwhile, a front surface side stacking surface 50a of the reject unit 50 is positioned so as to be cut more deeply, in the leftward direction of the apparatus, than the stacking surface 50b between the stopper members 52, and the rear surface side stacking surface 50c Further, the cut portion 51a of the side wall of the reject unit 50 on the apparatus front surface side is retracted, in the leftward direction of the apparatus, more greatly than the front surface side stacking surface 50a. On the apparatus front surface side, the stacking surface 50a is positioned so as to be cut more deeply than the other stacking surfaces 50b, 50c, and the cut portion 51a of the side wall is positioned so as to be cut more deeply than the stacking surface 50a. That is, on the apparatus front surface side, two levels of the cut portions are formed by the front surface side stacking surface 50a and the cut portion 51a of the side wall. [Operation Display Unit] FIG. 5 illustrates a positional relationship between the two banknote stacking units 30, 40 and the operation display unit 70. The banknote handling apparatus 1 has a characteristic that the banknote handling apparatus 1 is a small apparatus but has a large operation display unit 70 capable of displaying multiple information, and information for each banknote stacking unit is displayed on the operation display unit 70 so as to allow the relationship between the displayed information and each banknote stacking unit to be easily recognized. The operation display unit 70 is a touch panel type liquid crystal display device that has a 7-inch liquid crystal screen having a longitudinal dimension of 107 mm and a transverse dimension of 142 mm, displays information such as characters, still images, and moving images in color, and can receive input of information through
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