Efficient incremental backups using a change database is disclosed. The display apparatus includes input means for accepting the instruction by a user, and control means for controlling a display of the object to be displayed on the display means so that zooming out of the display on the display means is started and then the zoomed out display is zoomed in to the original size according to the instruction by a user as a trigger. Since the jammed sheet of which reading has been completed should not be returned to the document tray, the document tray is maintained at a position as it is. Also, the voting ballot includes at least one contest identified in the ballot specification, wherein at least one of the selection areas is associated with the at least one contest.