The present invention relates to a wide-angle image providing method including: an image taking step of generating a first region image obtained by taking an image of a first region and generating a second region image obtained by taking an image of a second region adjacent to the first region by a second camera module; a distortion calibration step of correcting distortion of each of the first and second region images by a distortion calibration unit; a phase difference calibration step of correcting a phase difference of each of the first and second region images; an overlap calibration step of correcting the first and second region images while overlapping the first and second region images to be adjacent to each other by an overlap calibration unit; and a color calibration step of correcting colors of the first and second region images which have been overlapped and calibrated.