Abstract: A communication system comprises a communication device; an access point (AP); and a communication server is provided. The communication system performs a method comprising: acquiring first information including movement information of the communication device; acquiring second information including position information of the AP; determining a connectable time corresponding to a length of time the communication device moves within a communicable range of the AP on the basis of the first information and the second information; and controlling a connection between the communication device and the AP on the basis of the connectable time.