An image generation system including a vertex processing section and a pixel processing section. When subjecting an object which is distant from a virtual camera to predetermined processing which is implemented by a first processing and a second processing, the vertex processing section performs the first processing with a processing load lower than a processing load of the second processing, and the pixel processing section performs the second processing. When subjecting an object which is close to the virtual camera to the predetermined processing which is implemented by a third processing and a fourth processing, the vertex processing section performs the third processing with a processing load higher than a processing load of the fourth processing, and the pixel processing section performs the fourth processing.