An illumination control system for controlling a plurality of illumination units (20-1 to 20-8) installed in a management area (Ao), the system comprising: a motion sensor (10-1, 10-2) acquiring position coordinate information and action information of a person in the management area; a necessary light amount database adapted to store position coordinate information for each of the illumination units and necessary light amount information for each type of action information of the person; a brightness control calculation unit acquiring a necessary amount of light, based on the necessary light amount information stored by the necessary light amount database, corresponding to the action information of the person acquired by the motion sensor, and calculating a brightness control amount for each illumination unit based on distances between the position coordinate information of the person and the position coordinate information of each illumination unit to set the acquired necessary amount of light at a place indicated by the position coordinate information of the person acquired by the motion sensor; and an illumination unit controller controlling the illumination units using the brightness control amount calculated by the brightness control calculation unit, characterised in that the management area (A 0) is composed of a plurality of area types in which the person performs different actions, the necessary light amount database is adapted to store a necessary amount of light for each type of action of the person for each area type, the brightness control calculation unit is adapted to specify one of said plurality of area types corresponding to the position coordinate information of the person acquired by the motion sensor (10-1, 10-2), acquire the necessary amount of light corresponding to the action information of the person in said one of said plurality of said area types, and calculate the brightness control amount of the illumination units to set the acquired necessary light amount at the place indicated by the position coordinate information of the person acquired by the motion sensor. a motion sensor (10-1, 10-2) acquiring position coordinate information and action information of a person in the management area; a necessary light amount database adapted to store position coordinate information for each of the illumination units and necessary light amount information for each type of action information of the person; a brightness control calculation unit acquiring a necessary amount of light, based on the necessary light amount information stored by the necessary light amount database, corresponding to the action information of the person acquired by the motion sensor, and calculating a brightness control amount for each illumination unit based on distances between the position coordinate information of the person and the position coordinate information of each illumination unit to set the acquired necessary amount of light at a place indicated by the position coordinate information of the person acquired by the motion sensor; and an illumination unit controller controlling the illumination units using the brightness control amount calculated by the brightness control calculation unit, characterised in that the management area (A 0) is composed of a plurality of area types in which the person performs different actions, the necessary light amount database is adapted to store a necessary amount of light for each type of action of the person for each area type, the brightness control calculation unit is adapted to specify one of said plurality of area types corresponding to the position coordinate information of the person acquired by the motion sensor (10-1, 10-2), acquire the necessary amount of light corresponding to the action information of the person in said one of said plurality of said area types, and calculate the brightness control amount of the illumination units to set the acquired necessary light amount at the place indicated by the position coordinate information of the person acquired by the motion sensor.