A method for controlling a laundry treatment apparatus, the laundry treatment apparatus including: a cabinet defining an appearance of the apparatus; a cabinet discharge hole defined in one face of the cabinet to exchange air inside the cabinet and air outside the cabinet with each other; a cylindrical drum disposed inside the cabinet; a drum motor configured for driving the drum; a duct defining a fluid channel for circulating air in the drum; a heat pump including: a blowing fan located inside the duct to circulate air inside the duct; an evaporator located inside the duct to cool air entering the duct; a condenser located inside the duct to heat air having passed through the evaporator; and a compressor located outside the duct to compress combustible refrigerant passing through the evaporator and to supply the compressed refrigerant to the condenser; and a fan configured for introducing air outside the cabinet through the cabinet discharge hole into the cabinet or for discharging air inside the cabinet through the cabinet discharge hole out of the cabinet, wherein the method comprises: operating the fan; operating the drum motor in a first rotational direction when a preset drum motor operation time duration has lapsed after the fan is set into operation; operating the compressor when a preset heat pump operation time duration has lapsed after the fan is set into operation; and stopping the operation of the fan when a preset fan operation time duration has elapsed. a cabinet defining an appearance of the apparatus; a cabinet discharge hole defined in one face of the cabinet to exchange air inside the cabinet and air outside the cabinet with each other; a cylindrical drum disposed inside the cabinet; a drum motor configured for driving the drum; a duct defining a fluid channel for circulating air in the drum; a heat pump including: a blowing fan located inside the duct to circulate air inside the duct; an evaporator located inside the duct to cool air entering the duct; a condenser located inside the duct to heat air having passed through the evaporator; and a compressor located outside the duct to compress combustible refrigerant passing through the evaporator and to supply the compressed refrigerant to the condenser; and a blowing fan located inside the duct to circulate air inside the duct; an evaporator located inside the duct to cool air entering the duct; a condenser located inside the duct to heat air having passed through the evaporator; and a compressor located outside the duct to compress combustible refrigerant passing through the evaporator and to supply the compressed refrigerant to the condenser; and a fan configured for introducing air outside the cabinet through the cabinet discharge hole into the cabinet or for discharging air inside the cabinet through the cabinet discharge hole out of the cabinet, wherein the method comprises: operating the fan; operating the drum motor in a first rotational direction when a preset drum motor operation time duration has lapsed after the fan is set into operation; operating the compressor when a preset heat pump operation time duration has lapsed after the fan is set into operation; and stopping the operation of the fan when a preset fan operation time duration has elapsed. operating the fan; operating the drum motor in a first rotational direction when a preset drum motor operation time duration has lapsed after the fan is set into operation; operating the compressor when a preset heat pump operation time duration has lapsed after the fan is set into operation; and stopping the operation of the fan when a preset fan operation time duration has elapsed.