Play list information is recorded on the local storage 200. The play list information contains main-path information and sub-path information. The main-path information specifies one among a plurality of AVClips as a MainClip and defines a main reproduction section for the MainClip. The sub-path information specifies another one among the plurality of AVClips as a SubClip and defines, for the SubClip, a sub reproduction section to be synchronized with the main reproduction section. On the local storage 200, an audio stream specified as the SubClip is recorded. The audio stream includes a plurality of PES packets which are each attached with a packet identifier (PID) that includes an upper field and a lower field. The upper field indicates that the audio stream containing the packet is a secondary audio stream whose reproduction output is able to be mixed with a reproduction output of the primary audio stream.