Method for updating a reverse index and server implementing such process

This update method of an inverted index, from at least one electronic document, each electronic document consisting of at least one ordered set of objects comprises, for each of said objects: - a step (E30) identifying a descriptor of the object, this descriptor being represented in the form of a tree; - a step (E50) for determining an end sheet of said shaft; and - a step (E60) of updating an information packet pointed by said sheet, said package information comprising at least the list of said documents having said object.