| 摘要 |
PROBLEM TO BE SOLVED: To allow efficient coexistence of a 2G (second generation) system network and a 3G (third generation) system network. SOLUTION: When a dual method in standby in a central area 2a in the 2G system network makes a call, the mobile terminal accesses the 3G system network. When the dual mobile terminal in standby in a peripheral area 2b in the 2G system network makes a call, the mobile terminal accesses the 2G system network for voice communication and accesses the 3G system network for data communication.
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