A device and method for adjusting the transparency of a display used for packaging a product are provided. The method includes: receiving a user input on the transparent display that encloses the product; adjusting the transparency of the transparent display based on the user input; and displaying information related to the product, which is enclosed by the transparent display, on the transparent display whose transparency has been adjusted. A transparent display with adjustable transparency includes a display configured to display product information provided by a product; a sensor configured to detect a user input on the transparent display; and a controller configured to adjust, based on the detected user input, the transparency of at least a portion of the transparent display determined by a device connected to the transparent display, and wherein the controller is configured to adjust the transparency of the determined portion according to control information received from the device.