A method of deriving a temporal motion vector predictor for decoding a current block by a video decoding apparatus, the method comprising: determining whether a first pixel (xPRb, yPRb) of a first temporal reference block which is a bottom right corner block neighboring a co-located block of the current block belongs to a Largest Coding Unit, LCU, to which the co-located block belongs, wherein the co-located block is located in a reference picture, wherein the coordinates xPRb and yPRb are obtained as xPRb=xP+nPSW and yPRb=yP+nPSH wherein (xP, yP) represent the coordinates of the top-leftmost pixel in the current block and the co-located block, and nPSW and nPSH represent the width and the height of the current block and the co-located block in units of pixels; deriving a reference prediction unit, colPu, which is a prediction unit in the reference picture based on the determination; and deriving a temporal motion vector predictor for the current block, wherein a motion vector of the colPu is used as the temporal motion vector predictor, wherein, in the step of deriving the colPu, the colPu is determined as the prediction unit covering specific coordinates in the reference picture, wherein, if the first pixel belongs to the LCU, the specific coordinates are specified by ((xPRb>>4)<<4, (yPRb>>4)<<4), and wherein if the first pixel does not belong to the LCU, the specific coordinates are specified by ((xPCtr>>4)<<4, (yPCtr>>4)<<4), wherein a second pixel (xPCtr, yPCtr) of a second temporal reference block which is a bottom right center block is located inside the co-located block, wherein the coordinates xPCtr and yPCtr are obtained as xPCtr=xP+(nPSW>>1) and yPCtr=yP+(nPSH>>1). determining whether a first pixel (xPRb, yPRb) of a first temporal reference block which is a bottom right corner block neighboring a co-located block of the current block belongs to a Largest Coding Unit, LCU, to which the co-located block belongs, wherein the co-located block is located in a reference picture, wherein the coordinates xPRb and yPRb are obtained as xPRb=xP+nPSW and yPRb=yP+nPSH wherein (xP, yP) represent the coordinates of the top-leftmost pixel in the current block and the co-located block, and nPSW and nPSH represent the width and the height of the current block and the co-located block in units of pixels; deriving a reference prediction unit, colPu, which is a prediction unit in the reference picture based on the determination; and deriving a temporal motion vector predictor for the current block, wherein a motion vector of the colPu is used as the temporal motion vector predictor, wherein, in the step of deriving the colPu, the colPu is determined as the prediction unit covering specific coordinates in the reference picture, wherein, if the first pixel belongs to the LCU, the specific coordinates are specified by ((xPRb>>4)<<4, (yPRb>>4)<<4), and wherein if the first pixel does not belong to the LCU, the specific coordinates are specified by ((xPCtr>>4)<<4, (yPCtr>>4)<<4), wherein a second pixel (xPCtr, yPCtr) of a second temporal reference block which is a bottom right center block is located inside the co-located block, wherein the coordinates xPCtr and yPCtr are obtained as xPCtr=xP+(nPSW>>1) and yPCtr=yP+(nPSH>>1).