A refrigerator comprising: a plurality of storage compartments (11, 21, 31); a cool air supply device comprising a compressor and condenser provided at a rear lower part of a main body and an evaporator, a blowing fan, and a defrosting heater installed in one of the storage compartments (11, 21, 31); a low-temperature storage compartment damper to control supply of cool air to a low-temperature storage compartment selected from the storage compartments (11, 21, 31); a high-temperature storage compartment damper to control supply of hot air to a high-temperature storage compartment selected from the storage compartments (11, 21, 31); and a controller configured to control the low-temperature storage compartment damper to be opened and the high-temperature storage compartment damper to be closed while controlling the compressor and the blowing fan to be driven so that the temperature of the low-temperature storage compartment reaches a low set temperature, thereby supplying cool air to the low-temperature storage compartment, to control the driving of the compressor and blowing fan to be stopped and the low-temperature storage compartment damper to be closed when the temperature of the low-temperature storage compartment reaches the low set temperature, thereby stopping the supply of cool air to the low-temperature storage compartment, characterized in that it further controls the defrosting heater and blowing fan to be driven and the high-temperature storage compartment damper to be opened when the supply of cool air is stopped, thereby supplying hot air to the high-temperature storage compartment. a plurality of storage compartments (11, 21, 31); a cool air supply device comprising a compressor and condenser provided at a rear lower part of a main body and an evaporator, a blowing fan, and a defrosting heater installed in one of the storage compartments (11, 21, 31); a low-temperature storage compartment damper to control supply of cool air to a low-temperature storage compartment selected from the storage compartments (11, 21, 31); a high-temperature storage compartment damper to control supply of hot air to a high-temperature storage compartment selected from the storage compartments (11, 21, 31); and a controller configured to control the low-temperature storage compartment damper to be opened and the high-temperature storage compartment damper to be closed while controlling the compressor and the blowing fan to be driven so that the temperature of the low-temperature storage compartment reaches a low set temperature, thereby supplying cool air to the low-temperature storage compartment, to control the driving of the compressor and blowing fan to be stopped and the low-temperature storage compartment damper to be closed when the temperature of the low-temperature storage compartment reaches the low set temperature, thereby stopping the supply of cool air to the low-temperature storage compartment, characterized in that it further controls the defrosting heater and blowing fan to be driven and the high-temperature storage compartment damper to be opened when the supply of cool air is stopped, thereby supplying hot air to the high-temperature storage compartment.