2. The analysis device according to claim 1 , further comprising: analyzing the text document; forming index information for each word of the plurality of words contained in the text document; and storing the formed index information in the index storage unit.
2. The analysis device according to claim 1 , further comprising: analyzing the text document; forming index information for each word of the plurality of words contained in the text document; and storing the formed index information in the index storage unit. 4. The analysis device according to claim 2 , wherein the context information is formed for a plurality of predetermined contexts.