There is disclosed a document authoring system mainly comprising a server including an authoring management program to prepare a document including tables, and terminals connected via the Internet and including browsing software (browser). The authoring management program comprises a data management function portion which interprets instruction data concerning change/addition sent from these terminals and attaches a unique identification number to the data, an editing management function portion (DOM of XML) which adds/changes XML format data by a request from the terminal, a data conversion function portion (XSLT, CSS, XML parser) which converts the XML format data into HTML format data, a script tool (script group) which supplies an auxiliary operation function to the terminal, and a publication function portion (Web browser, server program) which publicates the HTML format data on the Internet in an accessible mode.