A method for supporting communication using two or more heterogeneous radio access technologies (RAT) includes the steps of: the terminal receiving a first message that includes whether to provide support to simultaneous access two or more RATs and parameters requesting that a notification be provided for the supported RAT from a base station in a first RAT network supporting a first RAT; transmitting, to the base station in the first RAT network, a second message including an indicator indicating whether to support simultaneous access to the two or more RAT networks and information on a supported RAT network type in response to the first message, wherein the supported second RAT network type corresponds to a network that is different from the first RAT network.