A communication apparatus includes: a specifying unit configured to specify a region in an image; a determination unit configured to determine a mode used for communication of image data from a plurality of modes including a first mode for communicating image data of a region of interest specified by the specifying unit, and a second mode for communicating, in addition to the image data of the region of interest, image data of a region of no interest which has not been specified by the specifying unit; and a communication unit configured to communicate image data with other communication apparatus in accordance with a mode determined by the determination unit.