A method or a first earth station in a satellite communication system including a plurality of earth stations connected by a single-hop connection accommodating corresponding terminals is provided. The method includes encapsulating a first control message received from a first terminal in a first control signal to transfer the first control signal including the encapsulated first control message through a first controlling line to a second earth station accommodating a second terminal on an incoming side among the plurality of earth stations; and performing circuit-switching of the first communicating line between the first earth station and the second earth station in accordance with the first control message.