PURPOSE: To precisely and quickly transmit various informations for moving area of a moving body such as a car to a player.

CONSTITUTION: A coordinate converting processing device 111 reads the information for the form of a course map stored in a polygon data memory 112, and conducts coordinate conversion, on the basis of the position of a player car from a polygon parameter memory 110 and its direction, regularly with the upper part of the player car as a visual point. The information of the coordinate-converted course map is transmitted to a polygon paint device 113, whereby the course map is displayed over the main image of a game. Namely, the miniature of the course is displayed together with the symbol of the player car. Since the coordinate conversion is performed regularly with a fixed upper part of the player car as the visual point, the player car is fixed, while the course map is relatively moved along the symbol of the player car. The display of the course map is changed not only by the change of the position of the player car but also by the change of the angle.