Image display system

The present invention is to mitigate the process load of display image when attaching multiple textures on polygon of three-dimensional map, etc. The means to solve the problem is to arrange the multiple textures of three-dimensional polygons that will attach to target object to represent buildings, etc. in a non-overlapping manner to form integrated texture. When displaying the target projection, read the integrated texture, specify part of the corresponding polygon and attach the specified part. It is not to generate new texture, but to directly use the integrated texture as well as to designate the part to be attached. Therefore, only integrated texture is to be read but not multiple textures, thereby decreasing the load of reading and processing as well as the process load of displaying.