1. A digital image stabilization method comprising: taking N frames of a target image with an exposure of T; dividing each of the N frames into predetermined blocks; selecting a reference frame from among the N frames by calculating the amount of motion between each frame and the other frames and selecting the one with minimal amount of motion; estimating a motion vector of each of the remaining frames based on a reference region of the reference frame; and generating a result frame by combining a weighted frame, which is obtained by mapping a weight calculated based on the estimated motion vector to each block, and a color component frame.