A laundry treating apparatus includes a tub configured to hold wash water, a drum rotatably supported in the tub and including a shaft disposed perpendicular with the ground, and a sub-drum detachably mounted to an inner circumferential surface of the drum and configured to wash laundry independently from the drum. An information tag is disposed in the sub-drum, the tag containing information about the laundry. A reading unit is configured to acquire the information about the laundry from the information tag. A control unit is configured to determine a washing course to be performed in the sub-drum based on the information acquired by the reading unit.