Provided is a solid state imaging apparatus including: a writing memory selecting unit connected between a plurality of vertical output lines and a plurality of memories, configured to selectively store a signal transmitted from at least one of the plurality of vertical output lines into at least one of the plurality of memories; a plurality of horizontal scanning channels configured to input the signals stored in the plurality of memories; and a reading memory selecting unit connected between the plurality of memories and the plurality of horizontal scanning channels, configured to selectively output the signal stored in the at least one of the plurality of memories to at least one of the plurality of horizontal scanning channels. The reading memory selecting unit is configured to output the signals in an order corresponding to spatial arrangement of photoelectric conversion elements.