In order to quickly establish a communication link between a user terminal and an access point, a communication system comprises: a user terminal; an access point configured to transmit and receive user data to and from the user terminal; a cellular base station assisting wireless communication between the user terminal and the access point; and a control server 4. The user terminal comprises a cellular communicator configured to transmit location information of the user terminal to the control server via the cellular base station. The control server comprises a controller configured to generate communication control information; and a network communicator configured to transmit notification information including the communication control information. The access point comprises a beam controller configured to control a beam pattern used for wireless communication between the access point and the user terminal based on the communication control information.