A method for merging information of high semantic level representing complex situations including several objects originating from several sensors ci, said information possibly being heterogeneous, said method including acquiring the various items of information arising from said sensors in raw form and transforming them so as to cast them into the form of conceptual graphs, a conceptual graph representing several concepts and the relations which exist between them, and being composed of entity nodes and relation nodes, with E the set of concept nodes defined on a support S, G1 and G2 two conceptual graphs defined on S, wherein the method determines a merging strategy denoted strategymerge as follows: strategymerge=fmerge◯fcomp:E×E→E∪{E×E} and said merging strategy is applied to the various items of information taking the form of graphs.