A system for generating concept structures respective of a plurality of multimedia data elements (MMDEs). The system comprises an attention processor (AP) for generating a plurality of items from a received MMDE of the plurality of MMDEs and determining which of the generated items that are of interest for signature generation; a signature generator (SG) for generating at least a signature responsive to at least an item of interest of the received MMDE of the plurality of MMDEs; a clustering processor (CP) for clustering a plurality of signatures received from the signature generator responsive of the plurality of MMDEs, and for creating a signature reduced cluster (SRC) of the cluster; and a concept generator (CG) for associating metadata with the SRC and matches the SRC with previously generated SRC such that SRCs that match form a concept structure comprised of a plurality of SRCs and their associated metadata.