The present invention involves retrieving edges that do not constitute a designated network model which is a network model designated by a user and are linked to nodes that constitute the designated network model, displaying retrieval results that include the retrieved edges and network model IDs corresponding to the edges in a selectable manner, and generating an integrated network model in which, when the retrieval results are selected by the user, the edges that are included in the selected retrieval results and the nodes that do not constitute the designated network model and are linked to the edges, are integrated into the designated network model.
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