A method, computer program, and system-model converter for converting system model. The method includes the steps of: receiving input of a conversion processing description about a structure of a multi-dimensional data model and extraction queries, where the multi-dimensional data model and the extraction queries extract at least one element from a plurality of model elements; and generating a hierarchical multi-dimensional data model from a graph model stored in a graph model storage unit on the basis of the inputted conversion processing description, where the hierarchical multi-dimensional data model includes dimensions having a hierarchical relationship.