This paper proposes the approach to a concept map merging using methods and tools developed for the same task in the domain of ontologies. The developed method is based on ideas that concept maps and ontologies have structural similarities, and mutual transformations between them are possible therefore tools and methods suitable for ontologies can be applied to concept maps. Concept map merging is necessary to extend the functionality of intelligent concept map-based knowledge assessment system IKAS for reuse of captured concept maps.