Abstract: A method of controlling a combined washing and drying machine is provided, which decreases the time required for completing the overall process from washing to drying. The method includes steps of inputting an operational command; performing washing and rinsing steps according to the operational command; simultaneously performing a dewatering step and a first drying step after completion of the watering and rinsing steps; and performing a second drying step after completion of the dewatering step. The first drying step may include the driving of a pump, a fan, a heater, and a drum motor, while the second drying step may include the driving of a supply valve in addition to the pump, fan, heater, and drum motor.