An image capturing apparatus generates an image of a high dynamic range that takes into account gain in addition to a range of change of storage capacitance. The image capturing apparatus having an image capturing device of a structure in which blocks each configured by a plurality of photoelectric conversion elements are arranged, includes a first control circuit, a second control circuit, and a generating circuit. The first control circuit is configured to control sensitivity in units of the blocks. The second control circuit is configured to control a gain of a signal for each block obtained by the image capturing device. The generating circuit is configured to, by mapping image data of blocks obtained under the control of the second control circuit to a region that accords with sensitivity set for the blocks in a preset high dynamic range, generate image data of the high dynamic range.