Radio terminal operation data write method in private mobile communication system

In a radio terminal operation data write method in a private mobile communication system including a multi-node PBX having a plurality of node exchanges connected to each other through a high-speed data line, a node exchange to which a maintenance terminal is connected specifies a registration node exchange of a radio terminal from a logical extension number which is unique within the multi-node PBX and added to the radio terminal, acquires information on a current location area node exchange of the radio terminal through the high-speed data line, and requests the current location area node exchange to write terminal operation data on the radio terminal. The current location area node exchange acquires termination operation data on the radio terminal from the registration node exchange through the high-speed data line in accordance with the logical extension number and writes the terminal operation data.