1. An image processing apparatus for processing images captured by an image capturing apparatus having an optical unit, the image processing apparatus comprising; an image input unit to receive a plurality of image frames of a subject captured by the image capturing apparatus along the time line from the image capturing apparatus; a tracking area setting unit to set a target tracking area on the plurality of image frames; a tracking unit to track the target tracking area on the plurality image frames along the time line; a subject condition prediction unit to predict a condition of the subject at a time point delayed from a time point when the most recent image frame of the plurality of image frames is captured based on a tracking result of the target tracking area being tracked along the plurality of image frames; and a parameter setting unit to set a parameter to be used for an image capturing of the subject based on the condition of the subject predicted by the subject condition prediction unit to the image capturing apparatus.