An air-conditioning control system provides an appropriate environment in accordance with a stress level of a person in a room and a use of a space in which the person stays. A deriver derives heartbeat-related parameters based on a body movement of the person. A determiner determines a stress level of the person at a current moment, based on the heartbeat-related parameters. A receiver receives a use of the space for the person. A CPU for appliance control (i) selects a heartbeat-related parameter to be changed, depending on the received use and the heartbeat-related parameters, and (ii) controls operation of the air conditioner to change the selected heartbeat-related parameter to be changed.
