A statistical data processing device includes: a first statistical image generation unit for generating statistical images including a first statistical image representing a first statistical value as a corresponding pixel value, and a second statistical image representing a second statistical value as a corresponding pixel value; a mask generation unit for generating a mask image, the mask image extracting, if one of a pixel of a first statistical image and a corresponding pixel of a second statistical image does not have a pixel value indicating a statistical value, a pixel not having a pixel value indicating the statistical value or other pixel; and a second statistical image generation unit for generating a third statistical image in which a pixel value of a pixel not having a pixel value indicating the statistical value is complemented with a pixel value of the other statistical image.