To make controllable a device to be monitored and controlled installed at a great distance from the center side, and to make installable a terminal side device to be monitored and controlled anywhere by using a portable telephone network.

A calling-out signal is transmitted to a certain remote monitoring control device 12 from the center equipment 14 side (Step S11). The calling-out signal from center equipment 14 is received on the remote monitoring control device 12 side (Step S12), and a reponse signal of the effect of receiving the calling-out signal is transmitted to the center equipment 14 side. The center equipment 14 side transmits control information by using a simple browser after receiving the response signal (Step S13). This control information is received (Step S14), and control according to the content of the control signal is performed on the monitoring object control device 10 (Step S15), and when completing the control, a control completion signal is transmitted to the center equipment 14 side (Step S16).