A communication converter includes: a first communication interface making capable of communicating with a medical control device through a predetermined communication cable; a second communication interface making capable of making a connection to a signal distribution unit which is provided in a housing device capable of housing one or more communication converters, and distributes a signal from the medical control device to each of the communication converters; a switch unit for switching communication lines to either a communication line through the first communication interface or a communication line through the second communication interface; a detection unit for detecting whether or not the signal distribution unit is connected to the second communication interface; a switch control unit for controlling the switch unit based on a detection result; and a third communication interface making capable of performing communications with a medical device.