CLEANER

Disclosed herein is a cleaner including a main body for sucking dust on the floor in a cleaning region while actively traveling, and a marker indication device for indicating a marker on the floor in the cleaning region while moving independently of the main body, wherein the main body includes an image acquisition unit acquiring a front image thereof, and a controller to track a movement trajectory of the marker on the acquired image, set a traveling path, in an actual space, corresponding to the movement trajectory, and control the main body such that the main body travels along the set traveling path.