According to one embodiment, an optical position detection IC outputs, in accordance with movement of an object on a detection area including a light-transmissive area which is disposed on a top surface of a housing. A control module controls a movement direction and a movement amount of a cursor, which is displayed on a display screen of a display device, based on an attitude signal which indicates in which of two directions the optical position detection IC is disposed, and movement amount information which is output from the optical position detection IC.