A cooling system includes an air conditioner capable of cooling a predetermined space and changing an air volume or set temperature; one or more electronic devices disposed in the predetermined space and including a fan of variable rotational speed; a temperature sensor configured to detect temperature of the electronic devices; and a control apparatus configured to select, based on an increase in the detected temperature, whether to increase the air volume or decrease the set temperature of the air conditioner or to increase the rotational speed of the fan, with reference to air-conditioner information indicating a relationship between cooling performance and power consumption of the air conditioner and fan information indicating a relationship between cooling performance and power consumption of the fan.