The present invention relates to a sensor for capturing an image and a method for controlling the same. An electronic device according to various embodiments of the present invention comprises an image sensor and one or more processors. The one or more processors may be configured to receive a signal for capturing a moving image and to acquire a first plurality of image frames according to a first frame rate through the image sensor in response to the signal, the first image frames comprising a first image frame and a second image frame corresponding to an external object. The acquiring operation comprises an operation of generating a first part of a moving image according to a second frame rate, which is lower than the first frame rate, using some image frames among the first plurality of image frames. The one or more processors may be configured to determine a change related to the external object at least on the basis of a brightness difference between a first brightness corresponding to the first image frame and a second brightness corresponding to the second image frame, to acquire a second plurality of image frames corresponding to the external object, when the change satisfies a predesignated condition, through the image sensor according to the first frame rate or a third frame rate that is different from the first frame rate, and to generate a second part of the moving image using one or more image frames among the second plurality of image frames.