Document summarization apparatus, method, and non-transitory computer readable medium

A document summarization method comprising causing a computer to:

• perform natural language processing on text included in a document to extract a plurality of linguistic representations and a first semantic relationship between the linguistic representations from the text;
• classify the linguistic representations into a plurality of clusters by semantic similarity;
• determine a second semantic relationship between the clusters based on the first semantic relationship;
• and
• generate a graph representing the clusters and the second semantic relationship.

A non-transitory computer readable medium including computer executable instructions, wherein the instructions, when executed by a processor, cause the processor to perform a method comprising:

• performing natural language processing on text included in a document to extract a plurality of linguistic representations and a first semantic relationship between the linguistic representations from the text;
• classifying the linguistic representations into a plurality of clusters by semantic similarity;
• determining a second semantic relationship between the clusters based on the first semantic relationship;
• and
• generating a graph representing the clusters and the second semantic relationship.