A signal processing apparatus includes a first image memory that stores input moving images, a noise reduction section that outputs noise-free images, an image switching section that selects and outputs one image of the input moving image and the output of the first image memory, and a freeze control section that reads, images corresponding to two or more screens including the screen with the smallest amount of blur of each screen of the input moving image based on a separated luminance signal and necessary to remove noise from the first image memory, causes the image switching section to output the images, and causes noise-free images using the images corresponding to the two or more screens including the screen with the smallest amount of blur to be consecutively outputted.