An electronic device of an embodiment of the present document may include an image sensor including a plurality of unit pixels, and at least one processor electrically connected to the image sensor. The image sensor may read out light quantity data inputted to the unit pixel twice or more with a first conversion gain, and read out the light quantity data with a second conversion gain lower than the first conversion gain, to obtain a first image frame, and present the first image frame to the at least one processor. In addition to this, various embodiments identified through the specification are possible.