If a horizontal skipping operation is performed and operations are performed on the basis of the signals severally held in a plurality of register circuits in a solid-state imaging apparatus including an AD converting circuit in each column to perform the arithmetic processing of a digitized signal, then the AD converters and the register circuits in the columns to be skipped, that is, not to be read out become the state of not participating in the operations, and there is room for an examination in the aspect of the utilization efficiency of the circuits. A unit for connecting a register circuit in a certain column to a register circuit in another column is provided to the solid-state imaging apparatus.