| 摘要 |
PROBLEM TO BE SOLVED: To provide a portable telephone system having simultaneous transmission function for transmitting information simultaneously over a wider range, without being limited in the region in which the cost can be lowered in inverse proportion to the number of users in the same radio zone. SOLUTION: Destination information for simultaneous transmission is registered in a plurality of portable telephones 2 and a portable switching center 3, and based on information delivered from various information providers 4 and the destination information for simultaneous transmission, the portable switching center 3 performs simultaneous transmission, utilizing a specified frequency in the band used for portable telephone or an idle frequency.
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