A method of decoding a video, the method comprising: receiving a bitstream including information about a last significant coefficient location of a transformation block; performing context-based arithmetic decoding on a prefix bitstring of the last significant coefficient location among the information about the last significant coefficient location; when the prefix bitstring is greater than a predetermined value, performing a bypass mode arithmetic decoding on a suffix bitstring of the last significant coefficient location among the information about the last significant coefficient location; performing inverse binarization on the prefix bitstring according to truncated binarization scheme to obtain an inverse-binarized prefix; performing inverse binarization on the suffix bitstring according to fixed-length binarization scheme to obtain an inverse-binarized suffix; and reconstructing a symbol indicating the last significant coefficient location of the transformation block by using the inverse-binarized prefix and the inverse-binarized suffix, wherein the context-based arithmetic decoding of the prefix bit string is performed by using a context index determined based on the size of the transformation block and the location of a bit of the prefix bit string, wherein the last significant coefficient location of the current transformation block is reconstructed by combining the inverse-binarized prefix and the inverse-binarized suffix, and wherein the reconstructed last significant coefficient location indicates one of information about a x coordinate of the last significant coefficient location in a direction of widths of the current transformation block and information about a y coordinate of the last significant coefficient location in a direction of heights of the current transformation block, wherein the predetermined value is a classification point between the prefix bitstring and the suffix bitstring, wherein the inverse-binarized suffix is a remaining value of a symbol indicating the last significant coefficient location of the transformation block after the inverse-binarized prefix is excluded from the symbol. receiving a bitstream including information about a last significant coefficient location of a transformation block; performing context-based arithmetic decoding on a prefix bitstring of the last significant coefficient location among the information about the last significant coefficient location; when the prefix bitstring is greater than a predetermined value, performing a bypass mode arithmetic decoding on a suffix bitstring of the last significant coefficient location among the information about the last significant coefficient location; performing inverse binarization on the prefix bitstring according to truncated binarization scheme to obtain an inverse-binarized prefix; performing inverse binarization on the suffix bitstring according to fixed-length binarization scheme to obtain an inverse-binarized suffix; and reconstructing a symbol indicating the last significant coefficient location of the transformation block by using the inverse-binarized prefix and the inverse-binarized suffix, wherein the context-based arithmetic decoding of the prefix bit string is performed by using a context index determined based on the size of the transformation block and the location of a bit of the prefix bit string, wherein the last significant coefficient location of the current transformation block is reconstructed by combining the inverse-binarized prefix and the inverse-binarized suffix, and wherein the reconstructed last significant coefficient location indicates one of information about a x coordinate of the last significant coefficient location in a direction of widths of the current transformation block and information about a y coordinate of the last significant coefficient location in a direction of heights of the current transformation block, wherein the predetermined value is a classification point between the prefix bitstring and the suffix bitstring, wherein the inverse-binarized suffix is a remaining value of a symbol indicating the last significant coefficient location of the transformation block after the inverse-binarized prefix is excluded from the symbol.