1. A method for performing out-focus of a camera having a first lens and a second lens, comprising: photographing a first image with the first lens and photographing a second image with the second lens of the same scene; extracting depth information of the photographed first image and second image using the photographed first image and second image; and performing out-focus on the first image or the second image using the extracted depth information, wherein the first image is an image having a higher resolution than a resolution of the second image or the first image has a higher optical magnification than an optical magnification of the second image, and wherein extracting depth information comprises down-sampling the first image to the resolution of the second image when the first image is an image having the higher resolution than the resolution of the second image, the first down-sampled image is corrected to match the first down-sampled image to the second image, and the depth information is extracted from the first corrected image and the second image, and wherein extracting depth information comprises cropping a portion of the second image in order to make an image region acquired in the second image coincide with an image region acquired in the first image.