An artificial intelligence (AI) device installed in a first vehicle includes a sensing unit configured to sense an area in which the first vehicle is moveable at a current position, and a processor configured to receive a request for assignment of control authorization for allowing a first external vehicle to control the first vehicle from the first external vehicle, based on information sensed by the sensing unit, or to make a request to the second external vehicle for assignment of control authorization for allowing the AI device to control a second external vehicle.