To provide a publication system for allowing the writer of a book to save any economical load, and for allowing a publishing company to reduce a unit price by gathering fixed reservation in advance in order to prevent the book from ending up as a stock.

In this publication system, the copy of a book to be published on the Internet is introduced, and purchases who want to purchase the book are invited on the Internet, and when the number of copies of the book to be purchased by the purchasers reaches the number of publication above a break-even line, the book is published.