A picked up image displaying unit displays a picked up image on a display unit. A face authentication unit detects a face image of a registered user existing in the picked up image using face identification data retained in a registered user information retaining block. A position designation image processing unit displays a position designation image for designating a position of an object for the detected registered user on the display unit. An object authentication unit detects that an object image is included in the region designated by the position designation image.