An operation method of an electronic device is provided. The method includes generating a first bokeh image by blurring a part of an image acquired using at least one of a first camera module or a second camera module, by using a distance value determined based on the first camera module and the second camera module, and identifying whether a designated subject is included in the acquired image by using at least one of the first camera module or the second camera module; and in response to identifying that the designated subject is included, deactivating the second camera module, performing image segmentation on the acquired image by using the first camera module, and generating a second bokeh image by blurring a part of the acquired image, based on a result of the image segmentation.