In case the connection of a second interface is changed from MAG 221 of a home PMIPv6 domain to AR 222 of a CMIPv6 domain 231, {TAIL ~ a BU message} 262 is transmitted from the second interface to {HEAD ~ LMA/HA} 250, and identification information of this BU message is notified to MAG from the first interface 
In case the connection of a second interface is changed from MAG 221 of a home PMIPv6 domain to AR 222 of a CMIPv6 domain 231 , { TAIL ~ a BU message } 262 is transmitted from the second interface to { HEAD ~ LMA / HA } 250 , and identification information of this BU message is notified to MAG from the first interface
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