Provided herein is a PLC synchronization method including allocating a predetermined value with respect to a plurality of modulation symbols depending on whether sum of squared magnitude of in-phase component and orthogonal component is arranged in a predetermined range, calculating first moving sum and second moving sum of a value allocated to the plurality of modulation symbols, and performing PLC (physical layer link channel) synchronization based on the plurality of modulation symbols having maximum value of the first moving sum and the second moving sum.