A system and a method for establishing a group messaging session in consideration of a group policy in a communication system. A transmitter-side terminal stores information on a group policy in a group information storage unit, and transmits, to a server, an INVITE message requiring application of the group policy to generation of a group messaging session. The server receives the INVITE message, recognizes that the group policy should be applied to the generation of the group messaging session, and acquires the information on the group policy from the group information storage unit. The server transmits the INVITE message including the acquired group policy information to a receiver-side terminal that is invited to participate in the group session, and receives a response from the receiver-side terminal.