1. An image processing apparatus synthesizing a plurality of sub-images in a panoramic way to create a panoramic image, comprising: a face recognizing unit recognizing a person's face from a plurality of the sub-images; a sampling image selecting unit selecting a sub-image which has a face recognized by the face recognizing unit, out of a plurality of the sub-images as a sampling image; a sampling unit sampling a plurality of pixels from the selected sampling image; a correction parameter establishing unit extracting features from a plurality of the sampled pixels and establishing a correction parameter for image correction based on the extracted features; and an image processing unit synthesizing a plurality of the sub-images in a panoramic way and simultaneously correcting the entire panoramic image based on the established correction parameter.