A method of operating an Around View Monitoring (AVM) system according to the present invention includes: obtaining image data from image sensors disposed at different locations of a vehicle; performing image processing on the image data for improving an image; performing lens distortion correction on the processed image data; detecting an overlapping region from the corrected image data; selecting an image display method so as to prevent the detected overlapping region from overlapping when the image is synthesized, and synthesizing the image data according to the selected image display method; and outputting the synthesized image data.