An operation of a multi-type air conditioner, which includes a refrigerant distributor provided between one outdoor unit and a plurality of indoor units is controlled. A refrigerant supply controller determines indoor temperatures of a plurality of indoor units, decides to operate a compressor on the basis of the determined indoor temperatures, and transmits the determined operation of the compressor to an outdoor unit controller. The refrigerant supply controller determines the temperature of a refrigerant supplied to a plurality of operational indoor units and the temperature of a returned refrigerant, and adjusts the degree of opening/closing of a plurality of electronic expansion valves according to a difference between the determined temperatures of the supplied refrigerant and the returned refrigerant such that the amount of the refrigerant supplied to a plurality of indoor units are adjusted.