PURPOSE: To provide the operation/maintenance supporting system for electric power equipment, which has the simple constitution and can reduce the providing space of the entire system.

CONSTITUTION: Both the detected signal from a maintenance supporting detection means 1, which is attached to an electric power equipment, and the detected signal from a fault-point spotting and detecting means 2 are received with the same on-site board 11. The detected signals are processed in the on-site board 11, and the measured-value data and fault-point data are obtained. The measured-value data are sent into a maintenance supporting means 6, and the fault-point data are sent into a monitor control means 7. The state data of the electric power equipment are obtained with the maintenace supporting means 6 based on the measured-value data. The electric power equipment is monitored and controlled with the monitor control means 7 based on the fault- point data and the control data through a control means 5. The state data and the fault-point data are displayed on a display means 8.