In order to perform efficient dehumidification, this system is characterized by comprising: a total heat exchanger; a desiccant rotor; a main path through which air passes via the total heat exchanger, a cooling coil, and the desiccant rotor; a first bypass path that is connected to the main path in the front and rear of the total heat exchanger, and by which air bypasses the total heat exchanger; a second bypass path that is connected to the main path in the front and rear of the desiccant rotor, and by which air bypasses the desiccant rotor; and a control device that controls the air passing through the main path, the first bypass path, and the second bypass path on the basis of the enthalpy and humidity of outside air.
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