A control apparatus of the present disclosure includes a communication unit configured to receive adjustment information relating to brightness adjustment from a plurality of controlled objects capable of brightness adjustment, and to transmit an adjustment instruction relating to brightness adjustment to the plurality of controlled objects, and a controller configured to specify a first group, which includes at least one of the plurality of controlled objects adjusted brightness in a predetermined period among the plurality of controlled objects based on the adjustment information received by the communication unit, and a second group, which includes at least one of the plurality of controlled objects not included in the first group, and to determine the adjustment instruction based on the adjustment information in the plurality of controlled objects included in the first group, and to instruct the plurality of controlled objects included in the second group to adjust brightness by the instruction.