A controller 2a sets a target setting temperature for an air-conditioning space 10, compares a value obtained by subtracting an outdoor temperature detected by an outdoor temperature sensor 9 from the target setting temperature, with a first threshold related to the value, compares a value obtained by subtracting the outdoor temperature from an indoor temperature detected by an indoor temperature sensor 8, with a second threshold related to the value, compares a value obtained by subtracting a heat load in the air-conditioning space 10 from a cooling capacity, with a third threshold related to the value, and controls operation of a heat pump type air-conditioning device 2 and a ventilating device 3 on the basis of these comparison results. The first threshold, the second threshold, and the third threshold are set in accordance with the number of people detected by a human detection sensor 5.