1. A method for an operation of an electronic device, the method comprising: determining illuminance corresponding to a subject; automatically determining a capturing mode of an electronic device based on at least the illuminance; acquiring a first resulting image of the subject based on a first exposure time, if the capturing mode is a first capturing mode; and acquiring a plurality of images of the subject based on a second exposure time, if the capturing mode is a second capturing mode, and generating a second resulting image based on at least two images among the plurality of images.