An information input device including: an indicator detection unit; a pointer position setting unit which sets a position of a pointer to be displayed on a display screen; a storage unit which obtains and stores time-sequenced positional information which indicates the set position; a first passage detection unit which detects that the pointer has passed through a first specific region which is a predetermined region on the display screen, using the time-sequenced positional information; and a direction obtainment unit which obtains a direction in which the pointer has passed through the first specific region if it is detected that the pointer has passed through the first specific region; and a first image modifying unit which modifies a displayed image, depending on the obtained direction.