When determining that the W-RLF has occurred, the UE 100 transmits by an RRC message, to the eNB 200, a radio link failure report regarding the W-RLF (hereinafter, a “W-RLF report”). The W-RLF report may include information of at least any one of: a reason by which the W-RLF is determined to occur; and the most recent measurement result regarding the WLAN communication measured by the UE 100 (for example, a result of carrier sense, a measurement result of Beacon RSSI, a measurement result of RCPI, a measurement result of RSNI, etc.). It is noted that the reason by which the W-RLF is determined to occur is, for example, the W-RLF report is at least any one of: the interference state of the WLAN frequency band in the WLAN communication; a failure in transmission and reception in the WLAN communication; the received strength of a radio signal from the AP 300 performing the WLAN communication; and disconnection from the AP 300.