A method of identifying a behavior direction recognition based service requester includes a plurality of intelligent robot devices arranged in the airport and a server controlling movement of one or more intelligent robot devices of the plurality of intelligent robot devices. The intelligent robot includes a communication unit transmitting movement information of an airport user moving in the airport from the server, and a processor configured to receive the movement information of the airport user from the communication unit, learn movement of the airport user, recognize a wandering state of the airport user based on the learned movement of the airport user, and move to the airport user based on a result of the recognition. The intelligent robot device may be associated with an artificial intelligence module, an unmanned aerial vehicle (UAV), a robot, an augmented reality (AR) device, a virtual reality (VR) device, and devices related to 5G services.