Means for storing a reciprocal of the quantization matrix created for each of the luminance / color difference signals and the compression constants; position information of DCT coefficients and information for distinguishing between the luminance signals and the color difference signals; And means for performing a multiplication operation between a DCT coefficient and a reciprocal quantization matrix read out from the means for storing the reciprocal of the quantization matrix, The quantization matrix is preliminarily stored by taking the reciprocal of the quantization matrix, and is performed through multiplication of the inverse quantization matrix and the DCT coefficient, thereby simplifying the hardware implementation and improving the processing speed.
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