1. A method of predicting a motion vector for a current block in a current picture by a moving picture decoding device, the method comprising: remapping, by the moving picture decoding device, reference picture indices for a plurality of reference pictures, based on remapping information; obtaining, by the moving picture decoding device, at least one motion vector of a block, in a first picture, other than the current block, wherein the block other than the current block refers to at least one reference picture pointed to by a reference picture index for the plurality of reference pictures, comparing, by the moving picture decoding device, picture display order information of the first picture with picture display order information of the at least one reference picture, wherein the picture display order information of the first picture and the at least one reference picture represents a display order represented by a picture order count value; predicting, by the moving picture decoding device, a motion vector for the current block by using the at least one motion vector, based on a result of the comparing; and decoding, by the moving picture decoding device, the current block in the current picture using the predicted motion vector.