The driving method of the imaging apparatus, an imaging apparatus, an imaging system

While suppressing lowering of accuracy of the focus detection, to provide a technology that is progress faster. A plurality of pixels each having a plurality of photoelectric conversion elements, the first pixel of the portion of the plurality of pixels, a signal based on the charge obtained by adding the charge together to produce a plurality of photoelectric conversion element output It is, to a different second pixel, without outputting a plurality of second signals based on the charges photoelectric conversion element was produced which was arranged at a position of the photoelectric conversion elements, arranged in a first position the photoelectric conversion element to output a signal based on the electric charge is generated, to a different third pixel, without outputting a signal based on a charge photoelectric conversion elements arranged in the first position is generated, the second position photoelectric conversion elements arranged in order to output a signal based on the electric charge is generated.