Disclosed are a display device and controlling method thereof. The present invention includes a display unit configured to display a first content, a communication unit configured to connect communications with a plurality of external mobile terminals, and a controller configured to obtain personalization information corresponding to each of a plurality of the external mobile terminals, recognize an occurrence of an event related to the personalization information of a specific one of a plurality of the external mobile terminals, control the communication unit to transmit a signal indicating the event occurrence to the specific external mobile terminal, control the communication unit to receive a command signal for controlling the display device from the specific external mobile terminal.