Network system for session controlling of multi-channel broadcast based on ims and operating method thereof

A network system for controlling an IMS(IP Multimedia Subsystem)-based multi-channel broadcast session and its operation method are provided to create a new service through an application of an end-to-end multimedia session and a multicast session. An IMS(120) relays a channel session setting request operation between STBs(Set Top Boxes)(111,112) and a multi-channel broadcast server(150) requests reservation of resources for setting the channel session according to whether or not the multi-channel broadcast server accepts it. A resource and accept control system(130) determines whether to accept the resource reservation in response to the resource reservation request of the IMS. Multicast routers(141,14N) transfer broadcast data of a channel transmitted from the multi-channel broadcast server to the STBs according to a channel group joining request of the STBs.