A cellular communication system comprises: a UE configured to perform a WLAN-related process for switching an access network for accommodating a traffic of the UE to an E-UTRAN from a WLAN, on the basis of WLAN control information; and an eNB configured to manage a cell in which the UE exists. The UE transmits, to the eNB, a WLAN Interworking Indication indicating whether or not it is possible to perform the WLAN-related process, on the basis of at least one parameter related to the UE. The eNB having received the WLAN Interworking Indication determines whether or not to provide the UE with the WLAN control information, on the basis of the WLAN Interworking Indication.