In order to increase an adsorption rate of softener for laundry, a method of controlling a washing machine according to an embodiment includes performing a first rinsing process based on a first target water level and a first duty ratio of a motor; when a second rinsing process is started, supplying water to an intermediate water level of a fixed tub; additionally supplying water to a second target water level together with the softener; setting a duty ratio of the motor to a second duty ratio higher than the first duty ratio; and driving the motor based on the second duty ratio.