To provide a communication system capable of realizing an efficient multi-prepaid-service so as to enhance the quality and the convenience of a prepaid communication service.

A service transmission request means 11 transmits a service request of a prepaid service. A prepaid service implementation means 12 implements the prepaid service. A registration information transmission means 13 transmits registration information to implement the prepaid service. A user request reception means 21 receives the service request and the registration information. A prepaid control means 2 conducts prepaid control including distribution calculation processing of residual prepaid amount on the basis of a service request and registration information with respect to a plurality of simultaneously caused prepaid services. A prepaid service providing means 23 provides the prepaid service on the basis of the distributed residual amount.