Teaching data correction device

A training data correction device for correcting training data including sets of categories with a hierarchical structure and documents belonging to the categories, the training data correction device comprising processing circuitry configured to:

• acquire category information indicating a first category, which is one category, and a second category, which is a category having a hierarchical relationship with the first category and to which a document included in training data that should belong to the first category erroneously belongs or is likely to erroneously belong;
• and
• identify a feature term in a document that is included in the training data and that belongs to the first category indicated in the acquired category information and delete, from the training data, a set of documents including the identified term among documents included in the training data and belonging to a second category indicated in the category information.