A method and a filter system for storing information about messages coming in via a serial data bus of a communication network in a communication module of a user connected to the data bus, which are filtered using a filter system. In order to be able to implement a particularly simple and efficient storage of information about incoming messages even in the event of a great number of filter criteria, the invention provides for the filter system to include a list, which as list elements has one or multiple filter elements, which contain storage control information, and for a check to be performed on the basis of the storage control information as to whether information about an incoming message is to be stored, and information about an incoming message is stored if the check has determined that the information is to be stored.