Abstract: Processing at high speed is realized. Interpolation is carried out between vertexes of a series of vertexes and a series of vertexes taken as a longer series of vertexes of a strip. Interpolation is then carried out between each vertex of the interpolated series of vertexes and corresponding vertexes. Sub-strips are then generated using each of the interpolated vertexes. In this way, processing can be carried out at high speed after finely subdividing.