In such a timing game that a user taps on a collision position at a time when fore ends of a line object 51A and a line object 51B (hereinafter line objects 51) collide, a background image in perspective is displayed as if moving in depth direction. Simultaneously, the line objects 51 are moved corresponding to the background image. Therefore, it is possible to display the line objects 51 as if moving in depth direction, so that it is possible to provide the timing game with sense of speed.