To provide a management system capable of preventing the forgery or falsification of the certification of an object and easily managing it.

An ID, an authentication code, a guarantee content, the name of the object and the owner thereof are stored as data in a server 5 every formed IC tag 2. When the transaction of the object 1 is established, the ID and authentication code in the IC tag 2 are read by a reader/writer 3, and transmitted to the server 5 through a terminal device 4. In the server 5, the stored authentication code is read based on the received ID, and compared with the received authentication code to authenticate the IC tag 2. Thereafter, data for the guarantee content and the like are transmitted to the terminal device 4.