| 摘要 |
It is an object to provide a wireless communication terminal apparatus and a communication system acquisition control method that efficiently carry out the reselection among a plurality of communication systems to reduce electric power consumption and that can prevent a acquisition failure of an incoming call as much as possible. A control unit (18) includes a first reselection timer (long period timer (201)) that starts up reselection processing to shift from a registration state in a low priority communication system to a registration state in a high priority communication system and a second reselection timer that is shorter in period than that of the first reselection timer. When communication is carried out at in a registration state in a low priority communication system, the control unit registers base station information to use at a memory unit (17) and judges whether or not the base station information of a base station is registered at the memory unit (17) when in registration after the communication is finished. The control unit carries out the reselection processing by using the long period timer (201) in the case where the information is registered at the memory unit (17), or otherwise, the control unit carries out the reselection processing by using the short period timer (202).
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