An apparatus is provided which is capable of easily reconstructing (arranging) a piece of music depending on, for example, a feeling of a user listening to the piece of music. First acquisition means acquires data of a specific music content to be played back, from a music content data storage unit in which data of a plurality of music contents are stored. Second acquisition means acquires attribute information associated with the music content in units of music constituent elements from an attribute information storage unit. Third acquisition means acquires arrangement information associated with the music content and associated with the music construction information. In accordance with an arrangement request command issued by the user, the data of the music content being output as audio playback output data is reconstructed on the basis of the music construction information acquired by the second acquisition means and the arrangement information acquired by the third acquisition means.