The present invention relates to method and device for decoding a bitstream for a video signal in a decoding device, the method comprising the steps of: obtaining skip flag information about a current coding block from a bitstream; and, if the skip flag information indicates that a skip mode is applied with respect to the current coding block, performing inter-prediction for the current coding block by means of inter-prediction parameter information of a neighboring block of the current coding block. Moreover, the neighboring block of the current coding block comprises a plurality of temporal neighboring blocks and spatial neighboring blocks adjacent to the current coding block. Also, the step of performing inter-prediction for the current coding block comprises: dividing of the current coding block into a plurality of sub-blocks; with respect to each of the plurality of sub-blocks, obtaining of inter-prediction parameter information for the corresponding sub-blocks from neighboring blocks that are adjacent to the corresponding sub-blocks among the neighboring blocks of the current coding blocks; and obtaining of a predicted value for the corresponding sub-blocks on the basis of the obtained inter-prediction parameter information.