Disclosed is a bridge device supporting an alarm format, which transmits an event which occurs based on an image of a camera that photographs a monitoring area of an alarm panel in an alarm format according to an alarm format of an alarm panel transmitting alarm information in a predetermined alarm format when sensing by a sensor in the monitoring area in the alarm format and supports to interlock with the alarm panel while providing an image of the monitoring area where an event corresponding to the alarm information of the alarm panel.