A communication method comprises the following steps: receiving an IFOM triggering message by a packet data network gateway (P-GW); selecting one or more evolved packet system (EPS) bearers by the P-GW based on the IFOM triggering message, and making a bearer division if IP flows associated with a user equipment (UE) are not allowed to a first access network; sending a first request to the first access network in response to the bearer division; updating a mapping table if the first request is acknowledged by the first access network; and initiating a third generation partnership project (3GPP) bearer update procedure to move the one or more EPS bearers selected by the P-GW to the first access network.