1. A texture creation method comprising: arranging one or more three-dimensional objects in a space, and rendering the three-dimensional objects in a rendering area through hidden surface elimination processing with reference to Z values thereof indicating depths from a viewpoint; dividing the rendering area into a plurality of mutually congruent areas; and merging the divided areas into a predetermined target rendering area, wherein at the time of merging the divided areas into the predetermined target rendering area, pixel data and Z values are updated based on a result of comparison between the Z values of overlapping pixels, whereby the divided areas are merged into intended texture data.