| 摘要 |
A mobile communication system is comprised of a mobile phone device 1, a GSM network 100, and a W-CDMA network 200. A controller 17 mounted in the mobile phone device 1 updates GSM actually-used frequency data or W-CDMA actually-used frequency data both stored in a memory 18, in accordance with a DL frequency of a GSM cell or a W-CDMA cell detected by means of a GSM cell-searcher 13 or a W-CDMA cell-searcher 16. The controller 17 determines non-used frequencies not used in each of frequency bands, based on the actually-used frequency data, and causes the GSM cell-searcher 13 or the W-CDMA cell-searcher 16 to carry out cell-searching only with frequencies which may be used, except non-used frequencies.
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