One or more image processing apparatuses, one or more control methods therefor, and one or more storage mediums for use with same are provided herein. In at least one embodiment provided herein, an image processing apparatus includes a determining unit configured to selectively determine from a plurality of data formats a data format of still image data generated from un-development moving image data which may have a readjustable focal position, an instructing unit configured to instruct to output the still image data, and a generating unit configured to generate from the un-development moving image data the still image data in the data format determined by the determining unit in a case where the instructing unit instructs to output the still image data.