Abstract: A player is prevented from applying an excessive force to a button on a pressure sensitive controller. For a game device comprising a controller 32 for supplying one of digital values in a predetermined range in accordance with the force pressing a button, the predetermined range includes a response range in which at least some of the digital values smaller than a predetermined threshold fall, and a response limit range in which the digital value at said predetermined threshold or greater falls. When a digital value supplied from the controller 32 falls in the response range, a response image changing in accordance with a change in the digital value is displayed. On the other hand, when the value falls in the response limit range, a response limit image whose change in accordance with the digital value is limited is displayed.