The operation terminal control system

PROBLEM TO BE SOLVED: To provide a low-cost operation terminal control system enabling remote control of a plurality of operation terminals using a mobile terminal.SOLUTION: In a relay terminal 1A having an illumination switch function for switching a lighting state of an illumination apparatus, an operation communication unit 1a transmits an operation signal to an operation terminal 1 through a communication line L1, when a radio communication unit 1d receives an operation request for requesting operation of the operation terminal 1 from a mobile terminal 6. Based on the received operation signal, a control unit 1c of the operation terminal 1 controls a control apparatus 4.