A system controller according to the present invention communicates with a medical control device connectable to plural types of ultrasonic endoscopes. The system controller includes a plurality of operation instruction units, a communication unit, and a control unit. The plurality of operation instruction units are capable of issuing an instruction to the medical control device. The communication unit is capable of receiving a control command generated by the medical control device on the basis of table data representing the correspondence among the connection state of the ultrasonic endoscopes, the operational state of the medical control device, and the state of each of the plurality of operation instruction units. On the basis of the control command, the control unit performs a control to visually reflect, in each of the plurality of operation instruction units, the use state of respective functions achievable by the ultrasonic endoscopes and the medical control device.
