The present disclosure relates to an image pickup device, a control method, and an image pickup apparatus, which can implement more various data outputs.An image pickup apparatus of the present disclosure includes a pixel array in which incident light of an object is photoelectrically converted by a photoelectric conversion element at each of a plurality of pixels arranged in a matrix form, a selection unit that selects the number of A/D converters that output a pixel signal of each pixel in the pixel array, and a control unit that controls the selection unit and causes the selection unit to select the number of the A/D converters according to a request. The present disclosure can be applied to an image pickup device, a control method, and an image pickup apparatus.