| 摘要 |
PROBLEM TO BE SOLVED: To improve the operating convenience when any of plural communication modes such as a public mode is selected, an enterprise mode, and a home mode for the communication mode. SOLUTION: When the user operates a key for communication mode automatic setting, a control circuit discriminates whether or not a speech (communication) by the enterprise mode is available, based on a radio wave signal outputted from a radio base station for the enterprise mode at first (steps S1-S3). Then the control circuit discriminates whether or not a speech (communication) by the home mode is available, based on a radio wave signal outputted from a radio base station for the home mode (steps S5-S7). Furthermore, the control circuit discriminates whether or not a speech (communication) by the public mode is available, based on a radio wave signal outputted from a radio base station for the public mode (steps S8-S10). The control circuit sets two communication modes at most automatically to be valid among the three communication modes, and the user can make dialing/waiting for an incoming call of two telephone numbers at the same time at the most. |
