An electronic device is provided. The electronic device includes a camera with an image sensor including a plurality of image pixels arranged in a first direction and a second direction orthogonal to the first direction, for converting light incident on a plurality of micro-lenses into an electrical signal, performing a first correlation calculation for phase difference detection in the first direction based on the electrical signal, and outputting image data including a first phase difference correlation calculation value, an ISP configured to perform a second correlation calculation for phase difference detection in the second direction using phase difference information about the image data, and a driver configured to adjust a focus of the camera based on the first phase difference correlation calculation value for the first direction and a second phase difference correlation calculation value for the second direction.