A service ticket issuing system and service ticket issuing service are implemented by various communication terminals. A plurality of game devices 1001 to 100n are connected to the Internet IN, and the Internet IN is connected to a data supply center DSC which issues service tickets. The data supply center DSC is connected to a plurality of service providers SSC1 to SSCm via a communication line. For example, a user of the game device 1001 brings a backup memory 1131 with data of the service ticket stored therein to any of service providers SSC1, and presents the data to the service provider SSC1.