CENTER LOADING SYSTEM

PROBLEM TO BE SOLVED: To simplify operation at a control station, to reduce operating time at the control station and to reduce time for center loading in a center loading system for transferring a program to terminal stations from the control station. SOLUTION: Connection establishment between the modem of the control station and the modems of the terminal stations by dial up connection is abolished. After starting center loading, connection between a personal computer and the modem is established singly within the control station and connection between a processing part and the modem is established singly within each terminal station (Both of the modems of the control station and the terminal stations are enabled to input/output data). Then, after receiving an establishment reporting signal from all the terminal stations, the control station performs center loading simultaneously to all the terminal stations.