The present invention provides an electronic device and a method for processing an image. A method of the electronic device according to various embodiments can comprise the operations of: obtaining, using an image sensor, a plurality of images including a first image and a second image corresponding to external objects, providing, using the image sensor, at least a part of processed images of the plurality of images as a preview image; detecting image information based on at least the preview image; storing, in a buffer, images including at least the first and second images of the plurality of images; and synthesising, in response to an image capture related input, an image set including at least the first and second images of the images stored in the buffer using the image information so as to create a third image. In addition, the present invention may include other embodiments.