Peer-to-peer network system, proxy service peer, and method for peer interworking between overlay networks

A proxy service peer, comprising a request responding module, a proxy selecting module, and an information sending module, wherein:

• the request responding module is adapted to receive a query request from a requesting peer, and send the query request to the proxy selecting module;
• the proxy selecting module is adapted to determine address information of a requested peer according to the query request, or select a requested proxy service peer;
• and
• the information sending module is adapted to return address information of the requested peer or the selected requested proxy service peer to the requesting peer.

A method of peer interworking between Peer-to-Peer (P2P) overlay networks, comprising:

• obtaining, by a requesting peer, a proxy service peer list in a local overlay network, and selecting a proxy service peer in the proxy service peer list as the requesting proxy service peer;
• sending, by the requesting peer, a query request to the requesting proxy service peer, and receiving a query response containing a requested proxy service peer which is selected by the requesting proxy service peer;
• sending, by the requesting peer, a call request message to the requested proxy service peer;
• and receiving address information of a requested peer returned by the requested proxy service peer;
• and
• setting up, by the requesting peer, communication with the requested peer according to the address information of the requested peer.