1. An image scanning apparatus comprising: an automatic document conveying unit configured to feed multiple pages of a document loaded on a document feed tray one at a time; an image scanning unit configured to scan each page of the document fed by the automatic document conveying unit on a certain scanning face; a foreign object detecting unit configured to detect whether a foreign object exists on the scanning face based on the image data on the page of the document scanned on the scanning face of the image scanning unit; a display unit configured to display information relating to a result of the detection of the foreign object; and a control unit configured to cause the display unit to display the detection of a foreign object if a last page of the document loaded on the document feed tray is scanned on the scanning face of the image scanning unit and the foreign object on the scanning face is detected based on the image data on the last page of the document which is scanned; wherein, if the last page of the document loaded on the document feed tray is scanned on the scanning face of the image scanning unit and no foreign object is detected on the scanning face based on the image data on the last page of the document which is scanned even when a page other than the last page of the document loaded on the document feed tray is scanned on the scanning face of the image scanning unit and a foreign object on the scanning face is detected based on the image data on the page other than the last page of the document which is scanned, the control unit does not cause the display unit to display the detection of the foreign object.
1. An image scanning apparatus comprising: an automatic document conveying unit configured to feed multiple pages of a document loaded on a document feed tray one at a time; an image scanning unit configured to scan each page of the document fed by the automatic document conveying unit on a certain scanning face; a foreign object detecting unit configured to detect whether a foreign object exists on the scanning face based on the image data on the page of the document scanned on the scanning face of the image scanning unit; a display unit configured to display information relating to a result of the detection of the foreign object; and a control unit configured to cause the display unit to display the detection of a foreign object if a last page of the document loaded on the document feed tray is scanned on the scanning face of the image scanning unit and the foreign object on the scanning face is detected based on the image data on the last page of the document which is scanned; wherein, if the last page of the document loaded on the document feed tray is scanned on the scanning face of the image scanning unit and no foreign object is detected on the scanning face based on the image data on the last page of the document which is scanned even when a page other than the last page of the document loaded on the document feed tray is scanned on the scanning face of the image scanning unit and a foreign object on the scanning face is detected based on the image data on the page other than the last page of the document which is scanned, the control unit does not cause the display unit to display the detection of the foreign object. 2. The image scanning apparatus according to claim 1 , wherein the foreign object detecting unit detects a stripe pattern that extends in a scanning direction in the image data on the page of the document scanned by the image scanning unit to detect whether a foreign object exists on the scanning unit.