A glossary management device includes a read circuit, a storage circuit, an acquisition circuit, an analysis circuit, a term matching circuit, and a registration circuit. The storage circuit has a storage area for a glossary. The acquisition circuit acquires text data of a document if reading of the document is executed by a user. The analysis circuit performs analysis of the text data acquired by the acquisition circuit to identify a language of the document and parts of speech of text segments in the text data and extracts one or more text segments from the document based on the analysis. The term matching circuit performs matching for each of the extracted text segments against a public dictionary. The registration circuit adds to the glossary, each extracted text segment that does not match any entry term in the public dictionary.