An information processing apparatus includes a display having a display screen with a display-enabled display window, and a tablet having predetermined coordinates and permitting handwriting. A predetermined process is performed on the display window presented on the display in response to an operation on the tablet, and a size of the display window is updatable. The coordinates of the tablet are converted in response to the size updating of the display window presented on the display screen. If a portion of the display window is hidden in response to the display window becoming larger in size than the display screen, a peripheral portion of the tablet corresponding to the hidden portion of the display window is set as a movement operation area where the movement of the display window is controlled.