An electronic device comprising a memory; a camera; a communication unit; and at least one processor electrically connectable to the memory, the camera, and the communication unit. The at least one processor to: extract a frame from an image including a plurality of frames; identify an RGB vector of the frame; determine a light source vector by filtering the RGB vector of the frame through a first filter; identify an illuminance value of the frame; determine an illuminance value in relation to a composite image by filtering the illuminance value of the frame through a second filter; and generate synthetic light source information on the basis of the light source vector and the illuminance value in relation to the composite image.