Method of modifying image including photographing restricted element, and device and system for performing the method

摘要

Provided is a user device including: a storage configured to store data; and a controller configured to recognize a person included in an image captured by the user device or received by the user device from an external source, and change a part of the image corresponding to the recognized person to be unrecognizable in response to a degree of closeness between the recognized person and a user of the user device being lower than a predetermined level based on the data stored in the storage.