Information processing apparatus, information processing method, and program

An information processing method comprising:

• a two-dimensional cluster generating step of generating, in terms of documents acquired via a network and terms as words appearing in the documents, a two-dimensional cluster in which the documents that are similar in appearance tendency of the terms are grouped and the terms that are similar in appearance tendency in the documents are grouped;
• a one-dimensional cluster generating step of generating a one-dimensional cluster in which the terms that are similar in appearance tendency in the documents are grouped;
• a document updating step of adding, to a document storage section that stores the documents, a new document in terms of its acquisition time;
• and deletes, from the document storage section, an old document in terms of its acquisition time;
• a two-dimensional cluster updating step that causes the generation of the two-dimensional cluster based on the documents stored in the updated document storage section;
• and
• a one-dimensional cluster updating step that causes updating of the one-dimensional cluster based on the old document in terms of its acquisition time when it was deleted from the document storage section.

A program causing a computer to execute:

• a two-dimensional cluster generating step of generating, in terms of documents acquired via a network and in terms as words appearing in the documents, a two-dimensional cluster in which the documents that are similar in appearance tendency of the terms are grouped and the terms that are similar in appearance tendency in the documents are grouped;
• a one-dimensional cluster generating step of generating a one-dimensional cluster in which the terms similar in appearance tendency in the documents are grouped;
• a document updating step of adding, to a document storage section that stores the documents, a new document in terms of its acquisition time;
• and deletes, from the document storage section, an old document in terms of its acquisition time;
• a two-dimensional cluster updating step of generating the two-dimensional cluster based on the documents stored in the updated document storage section;
• and
• a one-dimensional cluster updating step of updating the one-dimensional cluster based on the old document in terms of its acquisition time when it was deleted from the document storage section.