A terminal device comprising: a display a detector configured to detect start of an authentication process for authenticating a user; and a display controller configured to: display, during the authentication process, an authentication process screen by using a first image included in a first display screen that is displayed after the authentication process succeeds, wherein, during the authentication process, the display controller is configured to: display a second display screen that is displayed before the authentication starts in addition to the first image; display the first image and the second display screen in different regions of the display; and upon starting the authentication process, slide the second display screen and display the first image, wherein the display controller brings the slid second display screen back into an original state in a case when the authentication process has failed, wherein the authentication is fingerprint authentication, the terminal device comprises a fingerprint reader configured to read a fingerprint of the user on a side surface, the display controller slides the second display screen in a direction perpendicular to the side surface on which the fingerprint reader is disposed; wherein the first image is formed of a line or a figure and the display controller deforms the line or the figure in the case when the authentication process has failed. a display a detector configured to detect start of an authentication process for authenticating a user; and a display controller configured to: display, during the authentication process, an authentication process screen by using a first image included in a first display screen that is displayed after the authentication process succeeds, wherein, during the authentication process, the display controller is configured to: display a second display screen that is displayed before the authentication starts in addition to the first image; display the first image and the second display screen in different regions of the display; and upon starting the authentication process, slide the second display screen and display the first image, wherein the display controller brings the slid second display screen back into an original state in a case when the authentication process has failed, wherein the authentication is fingerprint authentication, the terminal device comprises a fingerprint reader configured to read a fingerprint of the user on a side surface, the display controller slides the second display screen in a direction perpendicular to the side surface on which the fingerprint reader is disposed; wherein the first image is formed of a line or a figure and the display controller deforms the line or the figure in the case when the authentication process has failed. display, during the authentication process, an authentication process screen by using a first image included in a first display screen that is displayed after the authentication process succeeds, wherein, during the authentication process, the display controller is configured to: display a second display screen that is displayed before the authentication starts in addition to the first image; display the first image and the second display screen in different regions of the display; and upon starting the authentication process, slide the second display screen and display the first image, wherein the display controller brings the slid second display screen back into an original state in a case when the authentication process has failed, wherein the authentication is fingerprint authentication, the terminal device comprises a fingerprint reader configured to read a fingerprint of the user on a side surface, the display controller slides the second display screen in a direction perpendicular to the side surface on which the fingerprint reader is disposed; wherein the first image is formed of a line or a figure and the display controller deforms the line or the figure in the case when the authentication process has failed. display a second display screen that is displayed before the authentication starts in addition to the first image; display the first image and the second display screen in different regions of the display; and upon starting the authentication process, slide the second display screen and display the first image, wherein the display controller brings the slid second display screen back into an original state in a case when the authentication process has failed, wherein the authentication is fingerprint authentication, the terminal device comprises a fingerprint reader configured to read a fingerprint of the user on a side surface, the display controller slides the second display screen in a direction perpendicular to the side surface on which the fingerprint reader is disposed; wherein the first image is formed of a line or a figure and the display controller deforms the line or the figure in the case when the authentication process has failed.