An operation controlling system is provided with an operation controlling device that is installed removably in a facility equipment, and an operating terminal for sending an instruction signal to the operation controlling device. The operation controlling device not only has communicating means for receiving the instruction signal sent from the operating terminal, but also operation controlling means for turning ON/OFF, in accordance with the instruction signal, the facility equipment that is connected locally, and/or output controlling means for controlling, in accordance with the instruction signal, an output value of the facility equipment that is connected locally.