Abstract: In a mobile communications system in which dynamic IP addresses are assigned, a plurality of home agents are provided. A first home agent of the home agents includes a first holding section having a plurality of regional BCs each of which holds binding data and a plurality of transferred states. The first home agent further includes a selecting section for selecting a second home agent from the plural home agents and also selecting a regional BC for transfer from the plural regional BCs based on first load information and binding cache load information. The first home agent further includes a transmitter section for transmitting the regional BC for transfer toward the second home agent and also transmitting a registered destination change notification toward the mobile node. In addition, network reliability is enhanced while maintaining load dispersion and the performance of each home agent.