A terminal generates predetermined music information on a reproduced piece of music and reproduction frequency information including a reproduction count of the piece of music. Then, the terminal transmits the reproduction frequency information and its own apparatus ID to a server. When receiving the reproduction frequency information and the apparatus ID, the server computes a similarity coefficient between pieces of music reproduced by the terminal and an other terminal on the basis of the terminals' reproduction frequency information and apparatus IDs. The server then catalogs the computed similarity coefficient on a favorite list by associating the similarity coefficient with the reproduction frequency information's music information and the apparatus IDs. The server also identifies at least a similar piece of music reproduced by the terminal and the other terminal by referring to the favorite list. Finally, the server selects a piece of music reproduced by the other terminal but not reproduced by the terminal among the similar pieces of music. As a result, it is possible to determine a piece of music favorite with the user by executing a simple procedure.