A method for selectively operating compressors of a dual type unitary air conditioner includes respectively sensing compressor operation requiring signals outputted from a plurality of centralized warm and cold air circulators and a compressor operation requiring signal outputted from at least one individual warm and cold air circulator; changing the compressor operation requiring signals to numerical values for defining a total compressor capacity value by respectively applying weights to the signals; and selectively operating the compressors connected in parallel according to the obtained total compressor capacity value, thereby correctly selectively operating the compressors corresponding to the amount of an actually required load, thus improving user's comfort and increasing an energy efficiency of the dual type unitary air conditioner.