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, a BU message 262 is transmitted from the second interface to LMA/HA 250, and identification information of this BU message is notified to {HEAD ~ MAG} from {TAIL ~ the first interface} 
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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 , a BU message 262 is transmitted from the second interface to LMA / HA 250 , and identification information of this BU message is notified to { HEAD ~ MAG } from { TAIL ~ the first interface }
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