An image processing apparatus (200) according to the present embodiment includes a correcting unit (234, 235, 236, 237, 238). The correcting unit (234, 235, 236, 237, 238) identifies, based on an observation value of a residual contrast material component that is injected to a subject before a predetermined timing and remains in the subject, the residual contrast material component and a new contrast material component that is newly injected to the subject after the predetermined timing regarding a contrast material component that is included in an image, and corrects an observation value of the contrast material component includes in the image.
