A display state of input data and a setting dialog on a display screen is determined to display the setting dialog at an appropriate position based on a determination result. An information processing system includes a scanner apparatus for inputting data and a PC for displaying input data input by the scanner apparatus on a display screen of a large-sized display. The PC includes a display control portion for displaying the input data and the setting dialog for setting document reading conditions relating to the input data on the display screen, and a display state determining portion for determining a display state of the input data and the setting dialog. The display control portion controls a display position of the setting dialog based on a determination result by the display state determining portion.