| 摘要 |
It is an object of the present invention to provide a communication system, which can manage the contents of control transfer properly while adopting a control transfer method capable of making effective use of a telephone line. When use of a telephone line for a portable telephone 1 is transferred to slave terminals such as a portable telephone 10, a vending machine 11 with communication capability, a personal computer 12 with communication capability, and a car 13 with communication capability, the contents of transfer are stored in a predetermined memory of the portable telephone 1, while the contents of transfer to be transferred to each slave terminal are stored in a built-in memory of the slave terminal. On the other hand, a host computer 2 at an exchange is provided with a predetermined memory for cumulatively storing used transfer contents each time the slave terminal is connected using the transfer. The three memories are checked as appropriate to keep proper use of control transfer.
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