A radio terminal according to an embodiment includes a controller having a function of switching data between a wireless wide area network (WWAN) and a wireless local area network (WLAN) based on information configured from the WWAN; and a transmitter configured to transmit, to the WWAN, a WLAN measurement report in response to satisfaction of a predetermined condition, the WLAN measurement report including: a WLAN measurement results; and a WLAN related identifier indicating a WLAN to which the radio terminal has been connected. The predetermined condition includes a condition that the WLAN measurement is configured from the WWAN to the radio terminal.