To provide an illumination control system for controlling illumination instruments that may revise their control data to fit the places where they are installed.

An illumination control system comprises a central monitoring device 11 for preparing and storing illumination control data including the addresses of illumination instruments groups, lighting the illumination instruments groups, time schedule for lighting the illumination instruments groups, etc., control terminal 21 for controlling the lighting of the illumination instruments groups based on the illumination control data, monitoring terminal 31 for monitoring the lighting state of the illumination instruments groups, and external data reset device 51 for confirming and revising the illumination control data according to the output of the monitoring terminal 31.