Electronic device including image sensor and operating method thereof

An electronic device is provided. The electronic device includes an image sensor including a plurality of unit pixels, each unit pixel including two or more individual pixels, and at least one processor. The at least one processor is configured to acquire a first image frame from the image sensor, determine a photographing environment of the electronic device, based on the first image frame, and, in response to the photographing environment corresponding to a first photographing environment, control the image sensor to acquire analog data through the individual pixels, and provide first digital data digitally converted from the analog data with first sensitivity, and second digital data digitally converted from the analog data with second sensitivity which is higher than the first sensitivity, and acquire a second image frame which follows the first image frame, based on the first digital data and the second digital data.