A communication control method for performing an offload from a cellular RAN to a wireless LAN, comprising the steps of: transmitting information for the offload, by a cellular base station included in the cellular RAN; receiving the information from the cellular base station, by a user terminal which has a cellular communication unit and a wireless LAN communication unit and which exists in a cell of the cellular base station, wherein the information includes parameters to be applied to the access network selection; and performing by the user terminal an access network selection related to the offload between the cellular RAN and the wireless LAN on the basis of the information received from the cellular base station, the communication control method being characterized in that: the parameters include a first threshold to be compared with a cellular signal strength of the cellular RAN, a second threshold to be compared with a wireless LAN signal strength of the wireless LAN, and a third threshold to be compared with a load of the wireless LAN; and the step of performing the access network selection comprises a step of selecting the wireless LAN to perform the offload in response to: the cellular signal strength being lower than the first threshold, the wireless LAN signal strength being higher than the second threshold, and the load of the wireless LAN being lower than the third threshold. transmitting information for the offload, by a cellular base station included in the cellular RAN; receiving the information from the cellular base station, by a user terminal which has a cellular communication unit and a wireless LAN communication unit and which exists in a cell of the cellular base station, wherein the information includes parameters to be applied to the access network selection; and performing by the user terminal an access network selection related to the offload between the cellular RAN and the wireless LAN on the basis of the information received from the cellular base station, the communication control method being characterized in that: the parameters include a first threshold to be compared with a cellular signal strength of the cellular RAN, a second threshold to be compared with a wireless LAN signal strength of the wireless LAN, and a third threshold to be compared with a load of the wireless LAN; and the step of performing the access network selection comprises a step of selecting the wireless LAN to perform the offload in response to: the cellular signal strength being lower than the first threshold, the wireless LAN signal strength being higher than the second threshold, and the load of the wireless LAN being lower than the third threshold. the parameters include a first threshold to be compared with a cellular signal strength of the cellular RAN, a second threshold to be compared with a wireless LAN signal strength of the wireless LAN, and a third threshold to be compared with a load of the wireless LAN; and the step of performing the access network selection comprises a step of selecting the wireless LAN to perform the offload in response to: the cellular signal strength being lower than the first threshold, the wireless LAN signal strength being higher than the second threshold, and the load of the wireless LAN being lower than the third threshold.