Abstract: When logging in a server via an information network, high security is ensured without using a password. When a terminal 2 accesses a server 3, a random key is sent from the server 3. An operator inputs a fingerprint from an individual identification input device, and the terminal 2 collates the fingerprint information with registered fingerprint information previously registered. If a match is obtained, the terminal 2 generates a log-in packet, and transmits the log-in packet to the server 3. If a match is not obtained, the log-in processing is suspended. The server 3 resolves the received log-in packet, takes out the registered fingerprint information, fingerprint information, and a user code, and collates the registered fingerprint information with fingerprint information. If a match is obtained, the server 3 collates the transmitted user code with a user code previously stored in the server 3. If a match is not obtained, the log-in processing is suspended.

Abstract: This invention makes it possible to conveniently use various application softwares with high portability and high security. A CD-RW comprises a read-only physical access protect area and a rewritable area in which data can be rewritten. A plurality of application softwares, a user authentication program for performing user authentication by fingerprint collation, a fingerprint authentication engine, and the like are stored in the physical access protect area. A registered fingerprint data and a fingerprint information in which a corresponding user ID is stored in a protect area, which can not be copied, of the rewritable area, so that user authentication by fingerprint collation and user of the application software after the authentication are completed in one CD-RW.