The present invention is to select the disparate service providing entities to the disparate service request entity, a peer-to-peer (P2P) relates to a method for selecting a service provider entity in a network, system, service selection entity and a service management entity. Method comprising: receiving a service capability information of the service providing entity; Obtaining the service request information of the service request entity; And according to the service request for the service, the service request and the performance information of the service entity providing entity comprises a step of selecting a service provider entity of the service performance appropriate to provide service to the service request entity. The present invention is applicable to the P2P overlay network. ;
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