1. A system for realizing a multimedia service, comprising a service control request access subsystem, a service location register, a service middleware, a service control proxy, an interactive electronic program guide, EPG, and a service server, wherein the service middleware is configured to receive multimedia service location information updated by a subscriber, multimedia service scheduling policy of the service control proxy and device maintenance information of the service control proxy, to load them respectively to the service location register, and to start up or stop the corresponding service control proxy according to the device maintenance information of the service control proxy; the service control request access subsystem is configured to receive a subscriber multimedia service control request and forward the request to the service location register; the service location register is configured to authenticate the subscriber multimedia service control request according to the multimedia service location information, to determine the service control proxy for a subscriber having passed the authentication, according to the multimedia service scheduling policy, and to forward the subscriber multimedia service control request to the determined service control proxy; and the service control proxy is configured to perform multimedia service interaction control with the interactive EPG and to perform multimedia service control with the service server according to the subscriber multimedia service control request.