| 摘要 |
PROBLEM TO BE SOLVED: To automatically carry out calling with the optimal path in a dual terminal having a portable telephone function and a VoWLAN function. SOLUTION: The name of a registration user and an icon 44 showing that the user exists within a zone of VoWLAN network and an icon 45 showing the user's participating state in a specific service are displayed on a picture 41 of an expanded phone book. According to a calling operation, in-service area information of the VoWLAN of an incoming call destination is inquired to a server, and when the portable terminal itself and the incoming call destination exist within the area of VoWLAN, calling is carried out by using the VoWLAN. When the portable terminal itself is beyond the zone of the VoWLAN network and within the zone of 3G network, calling is carried out by using the 3G network. When the portable terminal itself is within the zones of both VoWALN network and 3G network, and the incoming call destination is beyond the zone of VoWLAN network, calling is carried out through the 3G network as long as both of the portable terminal itself and the incoming call destination participate in the specific service, and calling is carried out through the 3G network or a fixed network according to a preset priority order in the other case. COPYRIGHT: (C)2008,JPO&INPIT
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