1. A false contour reduction device, which reduces an occurrence of a false contour on a display screen of a display device, comprising: a false contour reducing unit for performing a false contour reducing process on a specific color false-contour-generating image signal, wherein the specific color false-contour-generating image signal is an image signal which is a false-contour-generating image signal and which has a specific color in a specific color range among input image signals, and the false-contour-generating image signal is an image signal which will generate a false contour.