A mobile phone system in which the incoming melodies, used in making a call, are not registered at the outset, and a desired incoming melody, out of plural incoming melodies, stored in a network server, may be selected and designated, so that a large variety of incoming melodies may be optionally designated each time a call is made. In a network server 103, there are stored plural incoming melodies. When making a call, a transmitting party selects, from a transmitting side mobile phone 101, an incoming melody for a receiving party, from the list of the incoming melodies in the network server 103, and transmits an ID corresponding to the selected incoming melody as a call signal to the network 102. The network server 103 reads out incoming melody data from the designated ID to send the so read-out data to an incoming side mobile phone 106.