1. An apparatus for decoding a moving picture, the apparatus comprising: an inverse quantization/transformation unit configured to generate a quantized block by inversely scanning a quantized coefficient sequence, generate a transform unit by inversely quantizing the quantized block using a quantization step size, and generate a residual block by inversely transforming the transform block; an inter prediction unit configured to generate a prediction block of a current prediction unit based on motion vector information; and an adding unit configured to generate a restored block using the residual block and the prediction block, wherein, when a motion information coding mode is a skip mode, the inter prediction unit restores motion information of the current prediction block using an available spatial or temporal skip candidate and generates the prediction block of the current prediction unit using the motion information, wherein the temporal skip candidate includes a reference picture index and a motion vector, the reference picture index of the temporal skip candidate is set to 0, and a motion vector of the temporal skip candidate is a motion vector of the temporal skip candidate in a temporal skip candidate picture, and wherein a size of the prediction unit is same with a size of a coding unit and the prediction block is set as the restored block.