A method, terminal and server for controlling a domain transfer operation, are discussed. According to an embodiment, the method includes determining, by a terminal, whether a session is transferred from a first domain to a second domain, wherein the determining is based on an operator policy and radio conditions, wherein the operator policy is received by the terminal from a network, and wherein the operator policy includes at least one of first information indicating an operator's preferred domain and second information indicating whether to initiate the domain transfer in a short time.