The recording medium is not only formed as a package medium such as a magnetic disk (including a floppy disk), an optical disk (including a CD-ROM (Compact Disc-Read Only Memory) and a DVD (Digital Versatile Disc)), a magneto-optical disk (including an MD (Mini Disc)) or a semiconductor memory or but also formed as a ROM (which corresponds to the ROM 22 of FIG. 1), a hard disk or the like in or on