A method for handover in a mobile communication system is disclosed, by which traffic is transmitted on an optimal path. In a communication system including at least one radio network node communicating with a mobile terminal and an access node controlling the radio network node, the present invention includes the steps of making a request for the handover of the mobile terminal to a specific second radio network node and the access node from a first radio network node communicating with the mobile terminal, notifying the first radio network node and the access node of a result of the handover request by the second radio network node, and controlling traffic transmissions to the first radio network node and the second radio network node according to the handover request and a result notification of the handover by the access node.