1. A method of decoding a video signal with a decoding apparatus, comprising: determining, with the decoding apparatus, a motion vector candidate set of a current block, the motion vector candidate set including a plurality of motion vector candidates, the plurality of motion vector candidates including at least one of a spatial motion vector and a temporal motion vector; obtaining, with the decoding apparatus, motion vector indication information of the current block from the video signal, the motion vector indication information indicating a motion vector candidate used for inter prediction of the current block among the plurality of motion vector candidates; extracting, with the decoding apparatus, the motion vector candidate corresponding to the motion vector indication information from the motion vector candidate set; determining, with the decoding apparatus, a predicted motion vector of the current block based on the extracted motion vector candidate; deriving, with the decoding apparatus, a motion vector of the current block based on the predicted motion vector and a motion vector difference of the current block; and performing, with the decoding apparatus, motion compensation on the current block based on the derived motion vector, wherein the determining the motion vector candidate set comprises: checking, with the decoding apparatus, whether a reference picture of the current block is equal to a reference picture of a neighboring block, the neighboring block including at least one of a left block, a top block and a top-right block adjacent to the current block; and when the neighboring block having a same reference picture as the current block exists according to the checking, setting, with the decoding apparatus, a motion vector of the neighboring block having the same reference picture to the spatial motion vector.