To provide a setting information input device and a setting information input method having high security because contents additionally written on a setting information input sheet by a user do not leak out when setting information that is not allowed to be seen by people except the user is set, such as setting a password of an access point of a radio LAN by using the setting information input sheet.

In the setting information input device and setting information input method, the setting information input sheet on which the user has additionally written is read and overwrite print is subsequently applied to the setting information input sheet.