A home appliance for controlling a harmonic magnitude includes a current sensor configured to detect an input current of a power source, and at least one processor, and the at least one processor is configured to obtain a harmonic component from the input current detected by the current sensor, determine a length of a non-conducting interval of a switch so that a magnitude of the obtained harmonic component is less than a predetermined harmonic reference value, and generate a current reference value corresponding to the determined length of the non-conducting interval.