To provide a portable telephone system capable of placing telephone calls with the use of another telephone number during telephone call, using a certain telephone number, registered in the portable telephone, by utilizing a slave set communicatable with the portable telephone, where a plurality of telephone numbers are registered, and to provide the portable telephone set that constitutes the portable telephone system.
When call origination is requested from the portable telephone set 10 or the slave set 20, while one or the plurality of telephone numbers registered in the portable telephone 10 are placing telephone calls, a call origination processing control part 111 performs call origination processing, by using the telephone number which is not making the telephone call, that is, establishes simultaneous telephone calls. When another call termination is received, while one or the plurality of telephone numbers registered in the portable telephone 10 are placing telephone calls, a call termination processing control part 112 reports or announces the call termination to the portable telephone set 10 and the slave set 20, and also establishes the telephone call of another call termination by the portable telephone set 10 or the slave set 20, which is not used for telephone calls, through the use of the telephone number which is not placing the telephone call.
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Kenichiro Sano
Yoshitaka Harita
Eiichi Shiragashi
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