An image processor for a game simulating reality such as a fight, comprising a display (3a), an operation panel (4a), a speaker (11a) and a game processing board (10a). The display (3a) displays fighters C1 and C2. When joysticks (41am, 41ah, etc.), on the operation panel (4a) are operated, this operation data is inputted to the game processing board (10a). The game processing board (10a) executesthe image processing of the fighters C1 and C2 on the basis of this operation signal, forms image signals on the basis of the image processing result, and displays them as the fighters C1 and C2 on the display (3a). The game processing board (10a) generates polygons and forms the head of the fighter C2 from a minimum number of polygons. When the displayed object formed of the minimum number of polygons is deformed, the number of polygons is increased.