In order to perform efficient dehumidification, this system is provided with: a desiccant outdoor air-conditioning unit (10) that performs dehumidification; an indoor air-conditioning unit (20) including a second air-supply fan (22) that supplies air indoors, and performing temperature adjustment; and a control device (30) that controls the air amount of the second air-supply fan (22). On the basis of an indoor state value (71), which is information about the indoor state, the control device (30) calculates an air-supply amount, and controls the air-supply fan in accordance with the calculated air-supply amount. The air-supply amount may be determined as follows: Air-supply amount = {Sensible heat load amount to be processed by the desiccant air-conditioning system (1a)/(Constant-pressure specific heat × Air density × Difference between the blowout temperature of supplied air and the indoor temperature)}.
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