1. An image processing device comprising: an image generation means configured to generate computer graphics images based on computer graphics description data; an image mapping means configured to designate an object or a part of the object of computer graphics drawn by the image generation means as a texture map target, and to texture map texture map images to a surface of the texture map target; and a superimposition means configured to superimpose superimposition images at a position corresponding to the texture map target of the computer graphics images where the texture map has been performed in the image mapping means, based on position information for the texture map target of the computer graphics image.