Abstract: Provided is an information system relating to commercial products, consulted from several sites, this information being classed according to types of object, including items that make up the product, sites, characteristics; tables of links called configurations making it possible to view links between a parent object and child objects, including configurations between an item and characteristics. It contains a new object denoted site item. And items contain shared configurations directly linking the parent item to characteristics shared by all the sites, and specific configurations linking the parent item to specific characteristics of each site via a global specific configuration which directly links the parent item to site items, each site item being linked to the specific characteristics by specific configurations of its site.