To display a significant image of which content can be grasped by omitting a monochrome image even in a moving image starting from the monochrome image, such as black and white, where the contents cannot be grasped easily.

Even in the moving image starting from the monochrome image, such as black and white, of which content cannot be easily grasped, a significant image in which contents can be grasped is displayed by verifying a change in a color signal in a picture, a change in luminance data in the picture, the bit rate of picture reproduction, a sound signal, a change in the bit rate of the picture reproduction, and the existence of caption data.