An air-conditioning-control apparatus of an air-conditioning system, which includes a plurality of air conditioners respectively provided in a plurality of sections obtained by virtually dividing a space to be air-conditioned, the conditioners configured to set the sections at desired temperatures, respectively, includes: a people-detection unit to detect presence or absence of a person in each of the sections; a memory to store temperature-adjustment data, for adjusting a setting temperature in each of the air conditioners, which is of a plurality of types each in accordance with a pattern of presence or absence of a person in each of the sections; and an adjustment unit to select the temperature-adjustment data of a pattern corresponding to a detection result of the people-detection unit from among the temperature-adjustment data of a plurality of types, and adjust the setting temperature of each of the air conditioners in accordance with the selected temperature-adjustment data.