A user terminal includes a controller configured to: camp on a first cell on a first frequency, in a Radio Resource Control (RRC) idle mode; find a second cell on a second frequency available for Device-to-Device (D2D) communication in response to the user terminal having an interest in the D2D communication; designate the second frequency as a highest priority frequency of cell reselection, for reselection to the second cell; and designate the second frequency as the highest priority frequency while camping on the second frequency.