The invention relates to a method and an apparatus for processing signals from messages on at least two data buses, particularly CAN buses, preferably in a vehicle, and to a corresponding system, wherein at least one signal is extracted from at least one message in a traffic node of the at least two data buses and at least one extracted signal value of the at least one signal is checked for a change relative to the signal value of the at least one signal that was most recently held in the memory unit, wherein the at least one extracted signal value of the at least one signal is held in the memory unit if the at least one extracted signal value of the at least one signal has changed relative to the signal value of the at least one signal that was most recently held in the memory unit.
