Electronic device comprising plurality of cameras using rolling shutter mode

An electronic device, comprising:

• a first camera configured to perform read-out at a first read-out speed;
• a second camera configured to perform read-out at a second read-out speed;
• and
• a processor,
• wherein the processor is configured to:
• receive a signal in which an external object is captured;
• obtain a first image based on a first exposure time using the first camera, in response to the signal, the first image corresponding to a first exposure period for the external object;
• obtain a plurality of second images based on a second exposure time using the second camera, the plurality of second images corresponding to a second exposure period including at least a portion of the first exposure period with respect to the external object;
• divide the first image into a plurality of regions including a first region and a second region, the first region corresponding to a first period included in the first exposure period and the second region corresponding to a second period which is included in the first exposure period and is different from the first period;
• and
• generate a third image in which the first image and at least some of the plurality of second images are synthesized, using a third region and a fourth region among some regions of the plurality of second images, the third region corresponding to the first period and corresponding to the first region and the fourth region corresponding to the second period and corresponding to the second region.