Abstract: A user authentication system capable of maintaining high-level security and of reducing a user's load of operations necessary for login is provided. The user authentication system includes a user terminal, a mobile phone, a password issuing unit, and a service providing unit. When a user accesses the system via the user terminal, the service providing unit encodes connection information of the password issuing unit into a code, and sends the encoded code to the user terminal. The mobile phone decodes the code displayed on the user terminal, and accesses the password issuing unit using the connection information. The password issuing unit generates a one-time password, and sends the one-time password to the service providing unit and also to the mobile phone. The user terminal sends the one-time password displayed on the mobile phone and user identification information to the service providing unit.

Abstract: A user authentication system includes a user terminal, a mobile phone, a password issuing unit, and a service providing unit. When the service providing unit receives user's data on user identification information from the user terminal, if the received data on the user identification information is registered in advance, the service providing unit sends the data to the password issuing unit. The password issuing unit searches connection information data of the mobile phone corresponding to the received data in the user identification information, generates a one-time password, and sends the one-time password to the mobile phone and to the service providing unit. The mobile phone displays the received one-time password. The user terminal sends the one-time password displayed on the mobile phone to the service providing unit.

Abstract: In a bookmark managing apparatus, connectable to a service server through a network and to a terminal of a user, for managing a bookmark for each user, bookmark managing information is stored which includes user ID information, connection information of the server, and a cookie for the server, associated with the user ID information. When the user is authenticated, the bookmark managing information of the user is searched to generate and transmit a list of the connection information of the user to the terminal. When receiving selection information indicating the connection information on the list from the terminal of the user, the bookmark managing apparatus makes a connection to the server with the connection information to forward data of the service from the server to the terminal of the user and when receiving a request from the service server for transmitting the cookie, transmits the cookie to the server. Corresponding method is also disclosed.