An image sensing apparatus capable of operating in at least a single-shot mode and a sequential mode, includes: an image sensor that outputs charge signals from a plurality of divided areas. A plurality of image processing units which respectively process the charge signals and output a plurality of image signals. A light source illuminates the plurality of divided areas of the image sensing device. Correction data is calculated on the basis of a plurality of image signals obtained by reading charge signals from the plurality of divided areas of the image sensing device, illuminating the image sensing device with the light source, and processing the read charge signals by the plurality of image processing units. The image signals are corrected using the correction data and combined to generate a combined image signal of a single image.