| 摘要 |
A telephone system provided with a key service unit having ports to which terminal telephone sets are connected. The unit has a first memory having memory areas each for storing at least one customer data for each port; a second memory for storing the data temporarily; and a control section for transferring the data between the memory areas through the second memory. The data to be transferred is first transferred from the first memory to the second memory temporarily; secondly data stored in a transfer destination memory area of the first memory (for a port to which a terminal set is newly connected) is transferred to a transfer start memory area of the first memory at which the data to be transferred is originally stored (for a port to which the same terminal set is so far connected); and finally the data already transferred to the second memory is transferred to the transfer destination memory area (as a new port data of the newly reconnected terminal set).
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