In an image sensing apparatus having an image sensing element that senses an object and outputs image data and an electronic zoom function, either a first processing mode or a second processing mode is set and an angle of view is designated. In the first processing mode, the image sensing element is driven by switching reading regions and reading methods of image data from the image sensing element based on the designated angle of view and the image data is read, processed, and the angle of view determined by the switched reading region is changed to the designated angle of view. In the second processing mode, the reading region and the reading method of the image data are fixed and the image data output from the image sensing element is processed, and the angle of view determined by the fixed reading region changed to the designated angle of view.