1. A method of decoding image information, comprising: receiving prediction information on an inter prediction to be applied to a current block; determining a merge mode between the merge mode and a motion vector prediction (MVP) mode for the current block based on the prediction information; and deriving motion information on the current block based on the determined merge mode and a plurality of candidate blocks, wherein the candidate blocks for the merge mode are located in same regions in which candidate blocks for the MVP mode are located.