Provided are a method for operating a terminal in a wireless communication system, and a terminal using the method. The method is characterized in that a cell re-selection is performed during an RRC connection re-establishment process, and if a second cell selected through the cell re-selection does not provide D2D configuration, D2D operation is performed using D2D configuration obtained in a first cell, which is a cell that existed prior to the initiation of the RRC connection re-establishment process.