A system controller configured to centrally control control target devices used in surgery includes a communicating device capable of communicating with a plurality of control target devices, an extraction condition memory capable of storing extraction conditions, and a processor including hardware. The processor detects an abnormal state of connected control target devices. The processor performs recording processing for recording operation information relating to operation on the control target devices as log data into a predetermined storage apparatus. When a device abnormality detecting section detects an abnormal state, the processor extracts relevant information related to the abnormal state from log data.