A method of decoding a video signal, comprising: deriving reference picture index information relating to a prediction target block from video data which is received and stored in a memory, the reference picture index information being used to determine a collocated picture comprising a collocated block relating to the prediction target block in a current picture; determining, based on the reference picture index information, the collocated picture among a plurality of decoded pictures; determining a temporal prediction motion vector of the prediction target block by scaling a motion vector of the collocated block in the collocated picture, the collocated block being determined one of a first collocated block adjacent a bottom right position of the prediction target block and a second collocated block including a central position of the prediction target block; generating a motion vector candidate list including the temporal prediction motion vector; and performing inter-prediction of the prediction target block based on the generated motion vector candidate list; wherein the motion vector of the collocated block is scaled based on a first and second distance, the first distance being a temporal distance between the current picture including the prediction target block and a reference picture referred by the prediction target block, and the second distance being a temporal distance between the collocated picture including the collocated block and a collocated block reference picture referred by the collocated block, wherein one of the first collocated block and the second collocated block is determined to be the collocated block based on whether a lower boundary of the prediction target block adjoins a lower boundary of a Largest Coding Unit, LCU, wherein when the lower boundary of the prediction target block adjoins a lower boundary of a Largest Coding Unit, LCU, the first collocated block is determined unavailable and the second collocated block is determined to be the collocated block, and wherein if a location of a point at a top-left of the prediction target block is (xP, yP), a width of the prediction target block is nPSW, and a height of the prediction target block is nPSH, the first collocated block is a block including a point at (xP+nPSW, yP+nPSH) within the collocated picture, and the second collocated block is a block including a point at (xP+(nPSW>>1), yP+(nPSH>>1)) within the collocated picture. deriving reference picture index information relating to a prediction target block from video data which is received and stored in a memory, the reference picture index information being used to determine a collocated picture comprising a collocated block relating to the prediction target block in a current picture; determining, based on the reference picture index information, the collocated picture among a plurality of decoded pictures; determining a temporal prediction motion vector of the prediction target block by scaling a motion vector of the collocated block in the collocated picture, the collocated block being determined one of a first collocated block adjacent a bottom right position of the prediction target block and a second collocated block including a central position of the prediction target block; generating a motion vector candidate list including the temporal prediction motion vector; and performing inter-prediction of the prediction target block based on the generated motion vector candidate list; wherein the motion vector of the collocated block is scaled based on a first and second distance, the first distance being a temporal distance between the current picture including the prediction target block and a reference picture referred by the prediction target block, and the second distance being a temporal distance between the collocated picture including the collocated block and a collocated block reference picture referred by the collocated block, wherein one of the first collocated block and the second collocated block is determined to be the collocated block based on whether a lower boundary of the prediction target block adjoins a lower boundary of a Largest Coding Unit, LCU, wherein when the lower boundary of the prediction target block adjoins a lower boundary of a Largest Coding Unit, LCU, the first collocated block is determined unavailable and the second collocated block is determined to be the collocated block, and wherein if a location of a point at a top-left of the prediction target block is (xP, yP), a width of the prediction target block is nPSW, and a height of the prediction target block is nPSH, the first collocated block is a block including a point at (xP+nPSW, yP+nPSH) within the collocated picture, and the second collocated block is a block including a point at (xP+(nPSW>>1), yP+(nPSH>>1)) within the collocated picture.