1. A method of reconfiguration of an aircraft environment surveillance device that includes first and second redundant electronic systems, where each system includes at least two surveillance sets able to provide information related to the aircraft's environment, said method comprising the following steps: detection of simultaneous unavailability of at least one surveillance set of said first system and at least one surveillance set of a second system; and determine if said at least two unavailable sets are not redundant sets, and automatically selecting information obtained, on the one hand, from available surveillance sets of said first system, and, on the other hand, from the redundant surveillance set or sets of the second system that matches the unavailable surveillance set or sets of the first system, wherein said above steps are implemented by a computer.