2. The information processing apparatus according to claim 1 , wherein the processor classifies the document by: obtaining a list of keywords capable of specifying the first category, and classifying the document into the first category, when the document contains the word that matches any of the keywords.
2. The information processing apparatus according to claim 1 , wherein the processor classifies the document by: obtaining a list of keywords capable of specifying the first category, and classifying the document into the first category, when the document contains the word that matches any of the keywords. 3. The information processing apparatus according to claim 2 , wherein the processor classifies the document into a first set of categories selected from a plurality of categories, when the document contains words, which match keywords associated with the first set of categories.