In this embodiment, the parser PARSER in the navigation manager NVMNG cannot directly play back files such as a manifest file MNFST, markup file MRKUP, script file SCRPT, and the like, which are located under the advanced navigation directory ADVNV indicated by advanced navigation files (see FIG. 11) and are obtained from the network server NTSRV or persistent storage PRSTR. That is, this embodime