A method for a device to device (D2D) communication-supporting user equipment detecting a synchronization signal, according to one embodiment of the present invention, comprises the steps of: on the basis of a first index set having a plurality of root indexes on a Zadoff-Chu sequence, detecting a first synchronization signal transmitted by a network; and, on the basis of a second index set having a plurality of root indexes that are different from the first index set, detecting a second synchronization signal transmitted by a D2D synchronization source, wherein the total number of the root indexes of the second index set is configured to be the total number of the root indexes of the first index set −1.