Method for controlling clothes treatment apparatus

A method for controlling a laundry treating apparatus,

• wherein the apparatus includes:
• a tub for receiving washing-water therein;
• a main drum rotatably disposed within the tub;
• a drive mechanism configured to drive the main drum;
• and
• an auxiliary drum disposed in the main drum so as to be attachable or detachable to or from an inner circumferential face of the main drum, wherein (i) a rotation of the auxiliary drum is dependent on a rotation of the main drum and (ii) washing of a laundry by the auxiliary drum is performed separately from washing of a laundry by the main drum,
• wherein the method comprises performing a positioning operation for allowing a predetermined portion of the auxiliary drum to be positioned at a target position via a rotation of the main drum,
• wherein the positioning operation comprises initiating, based on the predetermined portion reaching a first braking-initiation position such that the predetermined portion is positioned at the target position, a braking of the main drum,
• wherein the method further comprises varying the first braking-initiation position based on a magnitude of a load applied to the drive mechanism.