list, the A2D00001, A2D00002 . . . audio data files, the TBPLIST playlist table, the PLIST1 PLIST2 playlist and so on are formed as subdirectories in the HIFI directory as shown in the figure. [0115] The subdirectory names such as the folder names and file names A2D00002, PLIST1 and the file types constitute only temporary names used for providing an explanation. [0116] The track list TRKLIST is