Patent ID: 7725915

Claim:
An apparatus for changing channels in a digital broadcasting service, the apparatus comprising: a set top box unit being provided with a channel change protocol configured on a transmission control protocol/Internet protocol layer, said set top box unit transmitting a session setup request message configured on the transmission control protocol/Internet protocol layer the session setup requesting message for setting up a session, and said set top box transmitting a channel change request message through the channel change protocol, and the channel change request message requesting broadcasting data for a new channel; and a channel change server directly receiving the session setup request message and the channel change request message through the channel change protocol, directly transmitting a session setup confirmation message and a channel change confirmation message through the channel change protocol in response to the received session setup request message and channel change request message, said set top box unit directly receiving the session setup confirmation message and the channel change confirmation message from said channel change server through the channel change protocol, said channel change server directly transmitting the broadcasting data of the new channel to said set top box unit through the channel change protocol.