An imaging system comprising: an imaging device (12, 14, 15) which outputs a plurality of digital signals each of which indicating an amount of light entered on a corresponding one of a plurality of pixels; a white balance adjuster which reduces an amount of data per one pixel of the plurality of the digital signals output by said imaging device (12, 14, 15); an information amount reducing device which adjusts a white balance of the plurality of the digital signals output by the white balance adjuster and reduces an amount of data per one pixel of the plurality of the digital signals; a memory which stores digital signals; a memory controller which writes the digital signals in said memory, and reads the digital signals from said memory; a driver which drives said imaging device (12, 14, 15); a function controller which controls a transfer of digital signals among said white balance adjuster, said information amount reducing device, and said memory through said memory controller; a mode setter which sets one of a moving image mode and a still image mode to each of said driver and said function controller; and a signal processing device which applies a predetermined process on the digital signals output from the information amount reducing device to generate an image signal; wherein when the moving image mode is set by said mode setter, said function controller transfers the plurality of the digital signals output from said white balance adjuster to said information amount reducing device, transfers the plurality of the digital signals output from said information amount reducing device to said memory through said memory controller, and transfers the plurality of the digital signals output from the memory to the signal processing device, and when the still image mode is set by said mode setter, said function controller transfers the plurality of the digital signals output from said white balance adjuster to said memory through said memory controller, transfers the plurality of the digital signals output from said memory though said memory controller to said information amount reducing device, and transfers the plurality of the digital signals output from the information amount reducing device to the signal processing device. an imaging device (12, 14, 15) which outputs a plurality of digital signals each of which indicating an amount of light entered on a corresponding one of a plurality of pixels; a white balance adjuster which reduces an amount of data per one pixel of the plurality of the digital signals output by said imaging device (12, 14, 15); an information amount reducing device which adjusts a white balance of the plurality of the digital signals output by the white balance adjuster and reduces an amount of data per one pixel of the plurality of the digital signals; a memory which stores digital signals; a memory controller which writes the digital signals in said memory, and reads the digital signals from said memory; a driver which drives said imaging device (12, 14, 15); a function controller which controls a transfer of digital signals among said white balance adjuster, said information amount reducing device, and said memory through said memory controller; a mode setter which sets one of a moving image mode and a still image mode to each of said driver and said function controller; and a signal processing device which applies a predetermined process on the digital signals output from the information amount reducing device to generate an image signal; wherein when the moving image mode is set by said mode setter, said function controller transfers the plurality of the digital signals output from said white balance adjuster to said information amount reducing device, transfers the plurality of the digital signals output from said information amount reducing device to said memory through said memory controller, and transfers the plurality of the digital signals output from the memory to the signal processing device, and