Some embodiments are directed to a device that supports work of picking or sorting an article from a warehouse and the like, which allows the picking work to be carried out accurately and quickly. The device includes: a camera that photographs an automatically-readable identifier that is attached to a storage location of an article; an information processing unit that detects the identifier from an image photographed by the camera and processes the image of the identifier; and a display that displays information such as image information and text information. The information processing unit processes, based on the detected identifier and picking work order information, image on a specific identifier, and the processed image is displayed on the display at a location related to the identifier.