The present invention discloses a video decoding method through symbol decoding. Parses the symbols of the image blocks from the received bitstream, classifies the prefix bit string and the suffix bit string into a current symbol based on a threshold determined based on the size of the current block, and outputs the prefix bit string and the suffix bit string separately A video decoding method for performing arithmetic decoding in accordance with each determined arithmetic decoding method, and performing inverse binarization according to each binarization method determined individually for a prefix bit string and a suffix bit string after arithmetic decoding.
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