1. A multi-layered video decoding method comprising: (a) extracting base layer data and enhancement layer data from an input bitstream; (b) if there is no base layer from at the same temporal position as a first enhancement layer frame, generating a motion vector of the first enhancement layer frame by referring to the motion vector for at least one frame among base layer frames present immediately before and after the same temporal position as the first enhancement layer frame; (c) reconstructing the motion vector of the enhancement layer using the generated predicted motion vector; and (d) reconstructing a video sequence from texture data of the enhancement layer using the reconstructed motion vector of the enhancement layer.