The eNB 200 receives the W-RLF report from the UE 100, during the execution (control) of the cellular/WLAN aggregation. For example, the eNB 200 transmits, on the basis of the W-RLF report, to the AP 300 under the execution of the cellular/WLAN aggregation, information for releasing a data bearer for the WLAN communication in the cellular/WLAN aggregation (WLAN Release Request), or information for changing the data bearer for the WLAN communication in the cellular/WLAN aggregation to another data bearer (WLAN Modification Request). The AP 300 that has received the WLAN Release Request releases the data bearer for the WLAN communication in the cellular/WLAN aggregation. On the other hand, the AP 300 that has received the WLAN Modification Request starts control for changing the data bearer for the WLAN communication in the cellular/WLAN aggregation to another data bearer. For example, when executing the cellular/WLAN aggregation in a WLAN frequency band 1, the AP 300 performs the carrier sense, and starts control for executing the cellular/WLAN aggregation in a WLAN frequency band 2 of which the interference power amount is less than the threshold value.
When a change (or release) of the data bearer for the WLAN communication in the cellular/WLAN aggregation is performed, the eNB 200 transmits, to the UE 100, an RRC Connection Reconfiguration message for notifying the UE 100 of the change (or release) of the data bearer.