A storage portion stores musical contents in which a plurality of musical content material data sets each of which is given a piece of identification information and is encrypted are recorded, and location information for identifying respective locations at which the respective musical content material data sets are situated in the musical contents. The respective locations of the musical content material data sets are correlated with the respective identification information pieces of the musical content material data sets. For use of a desired musical content material data set, the location at which the musical content material data set having designated identification information is stored in the musical contents is identified on the basis of the location information. On the basis of the identified location, the desired musical content material data set is extracted and decrypted.