1. A recording apparatus comprising: an input unit configured to input a moving image signal; a moving image recording unit configured to record on a recording medium the moving image signal input by the input unit, the moving image recording unit starting to record the moving image signal on the recording medium in accordance with a moving image recording start instruction for instructing to start recording the moving image signal, and stopping recording the moving image signal in accordance with a moving image recording stop instruction for instructing to stop recording the moving image signal; a still image recording unit configured to generate a still image signal corresponding to a picture designated from a plurality of pictures included in the moving image signal input by the input unit, and to record the generated still image signal on the recording medium on which the moving image signal is recorded; and a controller that controls the still image recording unit to operate in response to the moving image recording start instruction, wherein the controller controls the still image recording unit to operate during a time period from the moving image recording start instruction to the moving image recording stop instruction so as to automatically generate a plurality of still image signals of different pictures and to record the plurality of still image signals on the recording medium on which the moving image signal is recorded, while the moving image recording unit records the moving image signal, and wherein the controller controls the still image recording unit to automatically record the still image signals of N pictures (where N is a predetermined integer of 2 or greater), among still image signals of more than N pictures generated during the time period from the moving image recording start instruction to the moving image recording stop instruction, on the recording medium on which the moving image signal is recorded, even if the still image recording unit generates the still image signals of more than N pictures during the time period from the moving image recording start instruction to the moving image recording stop instruction.