A smart watch comprising: a display configured to display a watch image including at least one of a digital watch image and an analog watch image; and a controller configured to: cause the display to reduce a size of the watch image when a preset event occurs; and cause the display to display notification information including at least one of schedule information, message reception notification information, email reception notification information, messenger reception notification information, missed call notification information, battery related notification information and update related notification information related to the preset event at an empty area of the display resulting from reducing the size of the watch image, characterized in that a display position of the notification information varies according to at least one of an occurrence time of the preset event, wherein the controller is further configured to cause the display to display a plurality of notification items corresponding to a plurality of preset events in a surrounding region of the watch image when a plurality of preset events are occurring sequentially. a display configured to display a watch image including at least one of a digital watch image and an analog watch image; and a controller configured to: cause the display to reduce a size of the watch image when a preset event occurs; and cause the display to display notification information including at least one of schedule information, message reception notification information, email reception notification information, messenger reception notification information, missed call notification information, battery related notification information and update related notification information related to the preset event at an empty area of the display resulting from reducing the size of the watch image, characterized in that a display position of the notification information varies according to at least one of an occurrence time of the preset event, wherein the controller is further configured to cause the display to display a plurality of notification items corresponding to a plurality of preset events in a surrounding region of the watch image when a plurality of preset events are occurring sequentially. cause the display to reduce a size of the watch image when a preset event occurs; and cause the display to display notification information including at least one of schedule information, message reception notification information, email reception notification information, messenger reception notification information, missed call notification information, battery related notification information and update related notification information related to the preset event at an empty area of the display resulting from reducing the size of the watch image, characterized in that a display position of the notification information varies according to at least one of an occurrence time of the preset event, wherein the controller is further configured to cause the display to display a plurality of notification items corresponding to a plurality of preset events in a surrounding region of the watch image when a plurality of preset events are occurring sequentially.