| 摘要 |
PROBLEM TO BE SOLVED: To allow a data communication device and a central managing device, and a customer equipment with a communication function and an opposite side to communicate with each other economically and efficiently although the same communication line is used. SOLUTION: The data communication device 11 temporarily cancels the setting of a customer line priority mode if the mode is set when data of a program, etc., which are transmitted through a communication line previously set in a public telephone line network 5 within a previously set specific communication time are received from a center system (central managing device) 1. A communication with the center system 1 is allowed and the communication line is connected; after the reception of the data from the center system 1 is completed, the communication line is disconnected and the customer line priority mode is set again. |
