Method, system, and apparatus for implementing multicast on shared network

A system for implementing multicast on shared network, comprising an office device and a plurality of terminal devices, wherein the office device comprises a table of correspondence between multicast program and terminal device;

• wherein the table of correspondence between multicast program and terminal device comprises a plurality of entries, each entry records a correspondence between multicast program information indicating a multicast program and terminal device identifier indicating terminal devices that have requested the multicast program;
• wherein the office device is configured to receive a multicast program request from a terminal device;
• wherein the multicast program request comprises multicast program information and a terminal device identifier;
• update the table of correspondence between multicast program and terminal device according to the multicast program information and a terminal device identifier carried in the multicast program request;
• and broadcast the updated table of correspondence between multicast program and terminal device and a multicast program indicated by the multicast program information the multicast program request carried;
• wherein the terminal device is configured to determine whether needs to receive the broadcasted multicast program according to the table of correspondence between multicast program and terminal device.

An apparatus for implementing multicast on shared network, comprising:

• a memory, configured to store a table of correspondence between multicast program and terminal device;
• wherein the table of correspondence between multicast program and terminal device comprises a plurality of entries, each entry records a correspondence between multicast program information indicating a multicast program and terminal device identifier indicating terminal devices that have requested the multicast program;
• a receiving module, configured to receive a multicast program request from a terminal device;
• wherein the multicast program request comprises multicast program information and a terminal device identifier;
• an entry maintenance module, configured to update the table of correspondence between multicast program and terminal device according to the multicast program information and a terminal device identifier carried in the multicast program request;
• and
• a sending module, configured to broadcast the updated table of correspondence between multicast program and terminal device and a multicast program indicated by the multicast program information the multicast program request carried, wherein the updated table of correspondence between multicast program and terminal device is used to indicate whether a terminal device needs to receive the broadcasted multicast program.