1. A solid state imaging apparatus, comprising: a pixel array in which pixels having color filters are arrayed in a matrix shape in accordance with a predetermined color arrangement, with each pixel including a plurality of divided pixels having a color filter of a same color; and an adding circuit that performs addition averaging of a plurality of signals output from the divided pixels that comprise a plurality of pixels having color filters of a same color, wherein, among the plurality of pixels that are an object of the addition averaging, a number of signals output from the respective divided pixels of which the adding circuit performs addition averaging is different for at least one pixel relative to other pixels.