Title information on music composition data recorded on a reproduction CD is acquired from a title information providing site and recorded on a recording MD together with composition data. A recording/reproducing apparatus (100) transmits TOC information acquired from the reproduction CD to a title information providing server (500) through a communication device (200), a wireless public communication network (WNET), a communication exchange (400), and the Internet (INET). The title information providing server (500) creates an inquiry code corresponding to the received TOC information and transmits it to a title information database (600). The title information database (600) sends a response code corresponding to the inquiry code as a reply to the title information providing server (500). The title information providing server (500) creates title information corresponding to the response code and transmits the title information to the recording/reproducing apparatus (100) through the devices and networks in the reverse direction to the direction in which the TOC information is transmitted. In the communication paths, the communication methods are converted for the respective devices.