Data communication method

The present invention includes: a procedure by which a destination foreign agent(FA2) recognizes the MAC address of a mobile node (MN); a procedure by which the FA2 registers the MAC address of the MN in a handoff request message (FHReq); a procedure by which the FA2 feeds the FHReq onto a transfer network; a procedure by which each of foreign agent (FAs) receives the FHReq, registers an IP address corresponding to the MAC address in the PHReq when the MAC address is registered in the binding list of the FAs themselves, and feeds the IP address onto the transfer network; a procedure by which the PA2 receives the FHReq, and temporarily registers the MAC address and the IP address in the binding list of the FA2 itself; and a procedure by which the FA2 transfers data sent from a home agent (HA) to the MN, based on the information which has been temporarily registered.