1. A terminal comprising: an image acquirer configured to acquire face image data from a camera while content is being displayed; a face recognizer configured to recognize a face included in the face image data; a face change detector configured to detect whether the recognized face is different from a face recognized in a previous image data; a contact searcher configured to, in response to the detection that the recognized face is different from the face recognized in the previous image data, search a contact corresponding to the newly recognized face; and an information transmitter configured to transmit content usage information to the searched contact.