When the user terminal is located in a cell boundary region of a WiBro network and a WCDMA network region, the user terminal does not issue a handover instruction unless the MIH server is in a handover condition, and accordingly the user terminal continuously transmits an event message to the MIH server A message overload control method of a heterogeneous network handover in which a user terminal can escape from a message overload state by instructing a handover to a user terminal when a message overload check is performed by the MIH server when it is determined to be a message overload And a system.;A media independent handover server according to the present invention includes: a communication unit for communicating with a user terminal, an ACR, a GGSN, an HA, and the like; A session manager for managing establishment and termination of a session for medium independent handover (MIH) to the user terminal; A handover execution unit for determining and executing a media independent handover (MIH) for the user terminal; A policy management unit for managing the MIH policy information and neighbor BS information; A DB interface part for interfacing with the database; And upon receiving an MIH link going-down message from the user terminal, starts a message overload check, and when the MIH link parameter report message is excessively received from the user terminal in a state other than a handover condition, And a controller for instructing the user terminal to perform heterogeneous network handover.;According to the present invention, when the IEEE 802.21 MIH is applied, performance degradation and network load of the MIH server due to a large amount of event messages can be prevented. Also, when the user terminal is stopped on the cell edge, If the condition is not over, the user terminal transmits a continuous event message to the MIH server. The MIH server performs message overload checking to instruct the user terminal to perform handover at the time of Message Overload, .;WiBro, WCDMA, Overload, RAS, ACR, RNC, Event, MIH, Handover, HA, Link
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