To grasp the condition of a device made by another company by means of a system controller in a control system controlling the device made by another company complying with no interactive communications.

The system controller 100 is connected to a communication transfer device 1 for converting communication protocol and input/output I/F (Interface) through a USB (Universal Serial Bus) cable 2 and is also connected to an operating table 120 made by another company through a remote cable 3. Control information inputted from an integrated operation panel 103 or a remote controller 104 is transferred for control, through the communication transfer device 1, to the operating table 120 made by another company from the system controller 100. Information inputted from an operation remote controller 121 devoted solely to the operating table made by another company is transferred to the communication transfer device 1 and is transferred once without exception to the system controller 100 through the USB cable 2.