7. A scroll display control device including a non-transitory computer readable medium which stores a program for causing a computer to execute scroll-displaying, in synchronism with reproduction of series information correlated to text information, the corresponding text information on a text display screen, said scroll display control device comprising: scroll speed calculation means which calculates a scroll speed of a target text on the basis of at least a time length of a series information section presently under reproduction and a quantity of the target text belonging to a target text section corresponding to the series information section during reproduction and text display setting information; control means which scroll-displays the target text belonging to the target text section at a display reference position of said text display screen according to said scroll speed; and a user instruction input means for dynamically changing the text display setting information related to the display reference position of the text display screen and the scroll method comprising a method for starting a scroll after a lapse of a predetermined time from a starting time of the target text, wherein text of a preceding text section which precedes the target text section and text of a succeeding text section which succeeds the target text section are respectively displayed in two adjacent areas across the target text section displayed at the display reference position of the text display screen, wherein the scroll speed calculation means calculates said scroll speed of the target text on the basis of the display reference position changed by the user instruction input means.
14. The scroll display control device according to claim 7 , wherein the target text belonging to the target text section corresponds to a picture section currently under reproduction, the picture section having the time length comprising a predetermined set of frames selected from a plurality of frames which make up the series information.