A commodity sales data processing apparatus comprising a docking station, an information processing apparatus which is mountable on and demountable from a docking station, and a point-of-sale server, The docking station comprising a wired LAN unit connected to said point-of-sale server and a wireless LAN unit; said the information processing apparatus comprising: a wireless LAN unit to communicate with said wireless LAN unit of the docking station; an input device configured to accept an operation input by an operator; an acquisition unit configured to acquire information indicating the operator; the acquisition unit including a camera to photograph an image of the operator; a memory configured to store the information indicating the operator acquired by the acquisition unit; and a processor configured: - to permit acceptance of the operation input by the input device without starting up the acquisition unit, when the apparatus is mounted on the docking station; - to permit acceptance of the operation input by the input device, when the operator is approved as a specific operator of the apparatus, based on a result of the user authentication; and the processor being configured, when the apparatus is demounted from the docking station: - to start up the camera; - to take at least one photograph frame image comprising a face image with said camera; - to transmit data of said face image to the point-of-sale server via the wired LAN unit of said docking station; said point-of-sale server being configured to: - determines whether or not a data of face image similar to the data of said face image transmitted is stored in a person-of-charge database of said server; - transmit a response data indicating said determination result to said apparatus via the docking station Wired LAN unit and the docking station Wireless LAN unit; the processor of the apparatus being further configured to: - perform a user authentication if the response data received from the server indicates that a data of face image similar to the data of said face image transmitted is stored in a person-of-charge database of said server. a wireless LAN unit to communicate with said wireless LAN unit of the docking station; an input device configured to accept an operation input by an operator; an acquisition unit configured to acquire information indicating the operator; the acquisition unit including a camera to photograph an image of the operator; a memory configured to store the information indicating the operator acquired by the acquisition unit; and a processor configured: - to permit acceptance of the operation input by the input device without starting up the acquisition unit, when the apparatus is mounted on the docking station; - to permit acceptance of the operation input by the input device, when the operator is approved as a specific operator of the apparatus, based on a result of the user authentication; and - to permit acceptance of the operation input by the input device without starting up the acquisition unit, when the apparatus is mounted on the docking station; - to permit acceptance of the operation input by the input device, when the operator is approved as a specific operator of the apparatus, based on a result of the user authentication; and the processor being configured, when the apparatus is demounted from the docking station: - to start up the camera; - to take at least one photograph frame image comprising a face image with said camera; - to transmit data of said face image to the point-of-sale server via the wired LAN unit of said docking station; - to start up the camera; - to take at least one photograph frame image comprising a face image with said camera; - to transmit data of said face image to the point-of-sale server via the wired LAN unit of said docking station; said point-of-sale server being configured to: - determines whether or not a data of face image similar to the data of said face image transmitted is stored in a person-of-charge database of said server; - transmit a response data indicating said determination result to said apparatus via the docking station Wired LAN unit and the docking station Wireless LAN unit; - determines whether or not a data of face image similar to the data of said face image transmitted is stored in a person-of-charge database of said server; - transmit a response data indicating said determination result to said apparatus via the docking station Wired LAN unit and the docking station Wireless LAN unit; the processor of the apparatus being further configured to: - perform a user authentication if the response data received from the server indicates that a data of face image similar to the data of said face image transmitted is stored in a person-of-charge database of said server. - perform a user authentication if the response data received from the server indicates that a data of face image similar to the data of said face image transmitted is stored in a person-of-charge database of said server.