A portable device includes: a communication unit configured to transmit and receive additional information corresponding to caller ID over a network; a storage unit configured to store the additional information; a sensor unit configured to detect at least one of a face and a gaze of a user; a display unit configured to display the additional information; and a controller configured to: receive an incoming call; detect the face of the user looking at the portable device; and display first additional information on the incoming call when the face is detected, wherein the first additional information is collected according to the caller ID of the incoming call.