An image processing apparatus for achieving the exchange of pieces of image data between a plurality of image processing apparatuses includes: a feature value extraction unit for extracting a feature value included in image data; a feature value transfer unit for transferring to another image processing apparatus a feature value extracted from image data to be exchanged; a feature value reception unit for receiving a feature value transferred from the other image processing apparatus; a first determination unit for determining whether the received feature value matches a feature value included in image data of a captured image; an image data transfer unit for transferring the image data of the captured image to the other image processing apparatus when there is a match between the feature values; and an image data reception unit for receiving image data of a captured image transferred from the other image processing apparatus.