The Thesaurus occitan (THESOC) is a multimedia database that aims at assembling all the dialectal data gathered in an oral form throughout the occitan-speaking region. It has two parts:  one deals with the lexicon, and the other, composed of sentences, is devoted to syntax.  Different tools and functionalities are associated with the data in order to allow researchers to constitute bodies of work and to formulate and verify hypotheses. This article presents the most recently upgraded form of the THESOC, its modalities of construction, and its methods of consultation.