Patent ID: 8335846

Claim:
An authentication system composed of a multi-functional peripheral and an authentication server that is connected to and is able to communicate with the multi-functional peripheral and performs authentication of login information input in the multi-functional peripheral, comprising: an initial display screen storage portion storing information to specify a screen capable of initially displaying at the time of login of the multi-functional peripheral in advance; and a judging portion comparing information to specify a last display screen of the multi-functional peripheral with information stored in the initial display screen storage portion and judging whether or not the information to specify the last display screen is appropriate as information to specify an initial display screen at the time of login, wherein when the judging portion judges that the last display screen at the time of logout of the multi-functional peripheral is inappropriate as the initial display screen, another screen in accordance with a predetermined condition is displayed in the multi-functional peripheral, and wherein the authentication server has: a storage portion storing information to specify the last display screen at the time of logout from the multi-functional peripheral that is given from the multi-functional peripheral; and a notifying portion notifying the multi-functional peripheral of initial mode setting information to instruct an initial display screen after login of the multi-functional peripheral, wherein the initial mode setting information includes the information to specify the last display screen and information to indicate that the last display screen is displayed as the initial display screen, and the multi-functional peripheral has: a notifying portion notifying the authentication server of the information to specify the last display screen at the time of logout of the multi-functional peripheral; a control portion controlling to display the last display screen as an initial display screen after login based on the initial mode setting information received from the authentication server; the initial display screen storage portion; and the judging portion, wherein the judging portion compares the information to specify the last display screen at the time of logout with the information stored in the initial display screen storage portion and judges whether or not the information to specify the last display screen is appropriate as information to specify an initial display screen at the time of next login, and notifies the authentication server of not the information to specify the last display screen at the time of logout but information to specify another screen in accordance with a predetermined condition as the information to specify the last display screen when the judging portion judges that the last display screen at the time of logout is inappropriate as the information to specify the initial display screen.