1. An image processing apparatus for processing images captured by an image capturing apparatus having an optical unit, the image processing apparatus comprising: processing circuitry configured to receive a plurality of image frames of a subject captured by the image capturing apparatus along a time line from the image capturing apparatus; set a target tracking area on the plurality of image frames; track the target tracking area on the plurality image frames along the time line between the plurality of image frames that are captured from a time point when a shutter button is partially pressed to a time point when the shutter button is fully pressed; 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, wherein the condition of the subject is a tracking-processed area size; and set a parameter to be used for an image capturing of the subject based on the predicted condition of the subject, wherein the parameter is an exposure level that is set based on a focus position at a subject distance, a position of the tracking-processed area size, and a size of the tracking-processed area size.