1. A document generation apparatus that generates document data with a font that can include a character font based on original document data, comprising: a comparator that compares a type of language of the original document data and a terminal language type of provided at a reproduction terminal that reproduces the original document data; and a generator that generates document data with a font based on the original document data that does not include a character font when results of the comparison performed by the comparator indicate that both types of languages match, and generates document data with a font based on the original document data that does include a character font used in the original document data when the results of the comparison performed by the comparator indicate that both types of language do not match, wherein the document data is attachment data to be attached to an e-mail, and if a top level domain of a recipient's domain name of the e-mail is a country code, said comparator employs a type of language corresponding to the country code as the terminal language type, and if the top level domain of the recipient's domain name of the e-mail is not a country code, said comparator employs a type of language input by a user as the terminal language type.