Patent ID: 11874873
Assignee: NEC CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 2:
3. The knowledge expansion system according to claim 1, wherein
the document structure graph includes nodes each having node type information indicating a type of the node,
the knowledge expansion system comprises a preprocessing execution unit that executes preprocessing when a node in a given document structure graph contains text having a dependency relationship, the preprocessing including performing dependency analysis on the text to divide the node into a plurality of nodes and assigning to respective one of the plurality of nodes information indicating a type of an element of the text obtained by the dependency analysis as the node type information, and
the subgraph extraction unit extracts, from the preprocessed document structure graph, a subgraph having at both ends a node in the document structure graph containing one of two words having a relationship in its text and a node in the document structure graph containing the other of the two words in its text on the basis of the inter-word relationship information.