1. An image processing apparatus that coordinates an appearance of noise among a plurality of videos, the apparatus comprising: a noise property obtainment unit that obtains noise properties from each of the plurality of videos; an evaluation value calculation unit that calculates noise evaluation values for each of the plurality of videos based on the noise properties; an added noise calculation unit that calculates respective noises to be added to the respective videos based on the noise evaluation values, so that the noise evaluation values resemble each other more closely as a result of the addition of the noise; and a noise adding unit that adds the added noise to the videos.