Abstract: [Problems] To provide a system for promoting user-friendly distribution of music composition data while considering the benefit of an author. [Means for Solving Problems] When a user operates a mobile telephone (8) to give a reproduction instruction for reproducing music composition content downloaded, the mobile telephone (8) performs reproduction by converting the music content into waveform music composition data. Here, the mobile telephone (8) generates feature data indicating a feature of the converted waveform music composition data (object feature data). Furthermore, it is judged whether right feature data matched with the object feature data is recorded. If not recorded, the mobile telephone (8) interrupts reproduction. If recorded, the mobile telephone (8) continues reproduction. Thus, only the mobile telephone (8) having the right feature data can reproduce the music composition content.