The present disclosure provides a robot cleaner including a driver for linearly moving or turning a body of the robot cleaner, a sensor for sensing a further cleaner in a sensed region having a predetermined angular range in front of the body, a communicator connected to a network, wherein the communicator acquires position information of the further cleaner, and a controller that, when the further cleaner is out of the sensed region of the sensor, identifies a position of the robot cleaner relative to the further cleaner based on the position information acquired by the communicator and a conversion matrix, and controls the driver such that the body follows the further cleaner.