1. A motion vector compression apparatus used in a video Encoder supporting multi-layered motion vectors, the motion vector compression apparatus comprising: a down-sampling module for down-sampling an original frame to have a size of a frame in each layer; a motion vector search module for obtaining a motion vector in which an error or a cost function is minimized with respect to the down-sample frame; a reference vector generation module for generating a reference vector in a predetermined enhanced layer based on a motion vector obtained from a block of a lower layer corresponding to a predetermined block in the predetermined enhanced layer and motion vectors in blocks in the lower layer around the corresponding lower layer block; and a motion difference module for calculating a difference between the obtained motion vector and the reference motion vector, wherein the reference motion vector in the predetermined enhanced layer is generated by designating a block in the lower layer having an area correlation with the predetermined block in the predetermined enhanced layer as a reference block of the lower layer, and interpolating the reference block of the lower layer by means of a predetermined filter, and wherein the interpolation is performed by applying different reflection ratios to the reference block of the lower layer in proportion to a area correlation.