1. An image processing apparatus comprising: a second-taken image generation unit which performs a blurring process on a first taken image including a plurality of small areas so as to generate a second taken image including a plurality of second small areas; a focus degree deriving unit which derives a focus degree of each small area of the first taken image; and a combination process unit which combines each small area of the first taken image with each second small area of the second taken image corresponding to each small area of the first taken image, wherein the combination process unit sets a mixing ratio of the second taken image in the combination to a larger value as a focus degree of each small area derived by the focus degree deriving unit is smaller, and the second-taken image generation unit includes a face area detection unit which detects a face image area from the first taken image, and a blurring process unit which performs the blurring process on the first taken image on the basis of the detected face image area so as to generate the second taken image.