The present invention is related to a signal adaptive filtering method and a signal adaptive filter for reducing ringing noise of image data, the filtering method comprising: for each pixel of the image to be filtered, the weights of (1, -1) and size 1x2 and 2x1 of using one-dimensional horizontal and vertical gradient operator to perform the gradient operation, and outputs the absolute value to the group as compared to the set threshold value of an edge pixel generated to produce the result as a binary value; Block edge map generation step to the pixel edge value generating step repeated for each pixel of a block having a predetermined size to generate a binary edge map for the entire block; Belong within the filter window by applying a group of filter window size set with respect to the generated binary edge map information and determining whether the binary edge map information includes edge information; If it determined that not include the edge information, mean filtering step of filtering by using the first weight value predetermined for each pixel in the pixel values ​​belonging to the filter window to generate a new pixel value; And when it is determined that contains the edge information, but each pixel creates a new pixel values ​​by filtering using a second weight value predetermined for the pixel value belonging to the filter window, the pixel that the edge information is located in the center of the filter window It is characterized in that it comprises a weighting filtering step are not filtered. According to the present invention, by eliminating the ringing noise from the restored image compression based on the blocks, resulting in an effect of improving the compression quality of the reconstructed image.