A garment processing apparatus comprising: a cabinet defining an external appearance of the apparatus, the cabinet having a laundry opening; a laundry accommodation unit placed within the cabinet and configured to store laundry introduced through the laundry opening; a circulation path (41, 43, 47) to guide air discharged from the laundry accommodation unit and resupply the air into the laundry accommodation unit; a heat exchanger exchanging the heat with the air introduced into the circulation path (41, 43, 47), the heat exchanger including: an evaporator configured to cool air introduced into the circulation path (41, 43, 47) via evaporation of refrigerant, the evaporator being located in the circulation path; a condenser configured to heat the air passed through the evaporator via condensation of the refrigerant, the condenser being located in the circulation path (41, 43, 47); and a compressor installed at the outside of the circulation path (41, 43, 47) to enable circulation of the refrigerant through the evaporator and the condenser; a blower configured to circulate the interior air of the laundry accommodation unit through the circulation path (41, 43, 47); a temperature sensor installed between the evaporator and the condenser; and, characterized by a dryness controller comparing the reference value with a value measured by the temperature sensor to determine the dryness of laundry or a termination time of the drying cycle, wherein the dryness controller is configured to determine the quantity of laundry by comparing the time at which the highest temperature is transmitted from the temperature sensor with data regarding a duration required until the laundry reaches the highest temperature set according to the amount of the laundry. a cabinet defining an external appearance of the apparatus, the cabinet having a laundry opening; a laundry accommodation unit placed within the cabinet and configured to store laundry introduced through the laundry opening; a circulation path (41, 43, 47) to guide air discharged from the laundry accommodation unit and resupply the air into the laundry accommodation unit; a heat exchanger exchanging the heat with the air introduced into the circulation path (41, 43, 47), the heat exchanger including: an evaporator configured to cool air introduced into the circulation path (41, 43, 47) via evaporation of refrigerant, the evaporator being located in the circulation path; a condenser configured to heat the air passed through the evaporator via condensation of the refrigerant, the condenser being located in the circulation path (41, 43, 47); and a compressor installed at the outside of the circulation path (41, 43, 47) to enable circulation of the refrigerant through the evaporator and the condenser; an evaporator configured to cool air introduced into the circulation path (41, 43, 47) via evaporation of refrigerant, the evaporator being located in the circulation path; a condenser configured to heat the air passed through the evaporator via condensation of the refrigerant, the condenser being located in the circulation path (41, 43, 47); and a compressor installed at the outside of the circulation path (41, 43, 47) to enable circulation of the refrigerant through the evaporator and the condenser; a blower configured to circulate the interior air of the laundry accommodation unit through the circulation path (41, 43, 47); a temperature sensor installed between the evaporator and the condenser; and, characterized by a dryness controller comparing the reference value with a value measured by the temperature sensor to determine the dryness of laundry or a termination time of the drying cycle, wherein the dryness controller is configured to determine the quantity of laundry by comparing the time at which the highest temperature is transmitted from the temperature sensor with data regarding a duration required until the laundry reaches the highest temperature set according to the amount of the laundry.