The player proceeds with a game while operating a touch panel to slant a game stage with a perception that the touch panel is a plane present in a game space and capable of freely slanting. The object moves in accordance with the slant of the game stage, and the viewing direction moves in accordance with the slant to such a position that the game stage appears slanting. Thus, a game allowing the player to input the slant of the game stage in the game space intuitively and easily can be provided.