1. A noise estimation method comprising: generating a first noise map including a plurality of regions for a current image; generating at least one second noise map including the plurality of regions for at least one image after the current image; calculating a plurality correlation values for each of the plurality of regions between the first noise map and the at least one second noise map; determining noise of the current image based on the calculated correlation values for each region; and adjusting a strength of noise cancellation for said each region based on a result of the noise determination, wherein the determining of the noise of the current image comprises: comparing correlation value for a corresponding region with a threshold value; excluding the corresponding region from the noise determination if the correlation value for the corresponding region is less than the threshold value; and determining the corresponding region as noise if the correlation value for the corresponding region is greater than the threshold value.