1. A method for aggregated annotation of a multimedia content, wherein said multimedia content comprising a plurality of segments, the said method comprising: extracting of said plurality of segments from said multimedia content, obtaining of a plurality of key-concepts, wherein each of said plurality of key-concepts is associated with at least one segment of said plurality of segments, performing of a multi-segment analysis of said plurality of key-concepts to select a plurality of most relevant key-concepts, obtaining of a plurality of relevance graphs, performing of a multi-graph analysis based on said plurality of most relevant key-concepts and said plurality of relevance graphs to select a plurality of best relevance graphs, performing of a multi-graph merging based on said plurality of best relevance graphs to identify a most relevant relevance graph, and annotating of said multimedia content based on said most relevant relevance graph.