A refrigerator, comprising: a compressor configured to compress refrigerant; a condenser configured to condense refrigerant compressed in the compressor; a refrigerating chamber evaporator configured to exchange heat with the air of a refrigerating chamber to evaporate refrigerant; a freezing chamber evaporator configured to exchange heat with the air of a freezing chamber to evaporate refrigerant; a first capillary and a second capillary configured to reduce a pressure of refrigerant condensed in the condenser, and connected to the freezing chamber evaporator to form refrigerant passages distinguished from each other; a third capillary configured to reduce a pressure of refrigerant condensed in the condenser, and connected to the refrigerating chamber evaporator to form a refrigerant passage; and a 4-way valve provided with an inlet connected to the condenser, and a first through a third outlet (212a, 212b, 212c) connected to the first through the third capillary to selectively distribute refrigerant to at least one of the first through the third capillary (212a' - 212c') according to the opening and closing of the first through the third outlet (212a - 212c), wherein the second capillary has a smaller inner diameter than that of the first capillary, characterized in that the operation of the 4-way valve is determined based on a first reference temperature corresponding to a passage blockage prevention operation, a second reference temperature corresponding to a fast load response operation, and a reference humidity corresponding to a dew condensation prevention operation the 4-way valve opens the second outlet when a temperature of the freezing chamber is above a set temperature of the freezing chamber, and an ambient temperature is between the first reference temperature and the second reference temperature, and an ambient humidity is lower than the reference humidity. a compressor configured to compress refrigerant; a condenser configured to condense refrigerant compressed in the compressor; a refrigerating chamber evaporator configured to exchange heat with the air of a refrigerating chamber to evaporate refrigerant; a freezing chamber evaporator configured to exchange heat with the air of a freezing chamber to evaporate refrigerant; a first capillary and a second capillary configured to reduce a pressure of refrigerant condensed in the condenser, and connected to the freezing chamber evaporator to form refrigerant passages distinguished from each other; a third capillary configured to reduce a pressure of refrigerant condensed in the condenser, and connected to the refrigerating chamber evaporator to form a refrigerant passage; and a 4-way valve provided with an inlet connected to the condenser, and a first through a third outlet (212a, 212b, 212c) connected to the first through the third capillary to selectively distribute refrigerant to at least one of the first through the third capillary (212a' - 212c') according to the opening and closing of the first through the third outlet (212a - 212c), wherein the second capillary has a smaller inner diameter than that of the first capillary, characterized in that the operation of the 4-way valve is determined based on a first reference temperature corresponding to a passage blockage prevention operation, a second reference temperature corresponding to a fast load response operation, and a reference humidity corresponding to a dew condensation prevention operation the 4-way valve opens the second outlet when a temperature of the freezing chamber is above a set temperature of the freezing chamber, and an ambient temperature is between the first reference temperature and the second reference temperature, and an ambient humidity is lower than the reference humidity.