ucted by means of an MPEG. In the coding method of this MPEG, there are MPEG1, MPEG2 and so forth, and in the MPEG1, a transfer speed is about 1.5 Mbps, and storage media such as a CD-ROM (Compact Disk-Read Only Memory) are mainly objects to which it is applied, and a motion compensation estimation/DCT (Discrete Cosine Transform) method into which periodical intra-frame coding is introduced is use