1. A digital still camera comprising: a solid-state electronic image sensing device for sensing the image of a subject repeatedly for an exposure time over which camera shake is thought not to occur, and repeatedly outputting image data representing the image of the subject; a combining device for generating one frame of a combined image obtained by combining the image of the subject represented by image data that has been output from said solid-state electronic image sensing device with the image of the subject represented by image data that was output from said solid-state electronic image sensing device by an immediately preceding image sensing operation, in such a manner that the images of the subject coincide; a combining control device for controlling said combining device so as to repeatedly execute processing for generating one frame of a combined image updated by combining the combined image, which is the result of combination by said combining device, with the image of the subject represented by image data that has been output from said solid-state electronic image sensing device, in such a manner that the images coincide; and a recording control device for recording, on a recording medium in response to an exposure-halt command and on the basis of timing at which the exposure-halt command has been applied, image data representing the combined image updated in the processing in said combining device that is based upon said combining control device.