A surveillance device and method provide access to a surveillance system for keeping a cabin of an aircraft under surveillance. A computer program may be used to execute the method for accessing the surveillance system. The surveillance device includes an authentication unit for examining an access-authorization request for access to the surveillance system, and a control unit for selecting, on the basis of the access-authorization request, a display unit from a plurality of display units provided in the aircraft, and for relaying a video-image signal corresponding to a captured video image of a subarea of the cabin of the aircraft to the selected display unit for the purpose of displaying the video image.