A game device includes a screen generator that displays a display target on a display screen of a display device, an input acquirer that acquires the position or direction of operation input to the display target from a touch panel annexed to the display screen of the display device and a back touch panel provided on a surface on the opposite side to the display screen of the display device, a determining section that determines the direction in which to operate the display target according to the position or direction of the operation input and the kind of the display target as the target of the operation when the input acquirer acquires the operation input to the display target from the back touch panel, and a movement controller or a rotation controller that operates the display target in the direction determined by the determining section.