| 摘要 |
PROBLEM TO BE SOLVED: To perform each kind of service using rich information without increasing the scale of a system configuration. SOLUTION: Additional display data being displayed by a button telephone 2 is generated from information controlled by a server 3 at an information distribution means 32A of the server 3, and are transmitted to a main device as additional display data to the button telephone 2. The additional display data from the server 3 are received and transmitted to the button telephone 2 by a data transmission means 12B of a main device 1, at the same time it is instructed to the button telephone 2 whether the additional display data are to be displayed or not by a display instruction means 12C, and the additional display data in a buffer 26B are displayed on a screen display section 27 according to the instruction for displaying or not displaying from the main device by control.
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