1. A method for removing image noise using pattern information, the method comprising the steps of: (a) carrying out region dispersion with respect to input image signals so that the input image signals are dispersed using a predetermined pixel size; (b) calculating mean brightness of the region-dispersed image signals and carrying out noise dispersion with respect to the input image signals; (c) switching a low frequency and a high frequency based on the noise-dispersed image signals; (d) removing noise from the switched image signals based on a statistic after obtaining a region average with respect to the switched image signals having the low frequency; and (e) removing noise from the images signals resulting from step (d) based on a similarity of pixels after analyzing patterns with relation to the image signals with the high frequency.