To reduce the troublesomeness of the filling of a document and to prevent the document from being erroneously filled for an applicant who applies the document.

A personal information extraction part 24 and a necessary information extraction part 27 of a document preparation device 2 extracts personal information necessary for the preparation of a document 50 with a document name supplied from a portable telephone 1 from personal information data supplied through the Internet 30. A document preparation part 28 prepares the document 50 with the document name supplied from the portable telephone 1 by using the personal information extracted by the necessary information extraction part 27 and document preparation data stored in a document preparation data DB215.