A portable terminal device (1) detects a touch position on a display screen (2) or detects that the display screen (2) is depressed. A border line (2B) is set in which the touch position at the time of detecting a pressing force is used as a reference. The display screen (2) is divided into a first screen (3) and a second screen (4) with reference to the border line (2B). An image corresponding to a function executed by the portable terminal device (1) is displayed on each of the divided first screen (3) and second screen (4).
