The menu originally refers to the list of various dishes provided by the restaurant. It is now extended to refer to the list of options appearing on the display screen during the progress of electronic computer programs, as well as the list of various service items, which has a broader meaning. The menu in a broad sense refers to all the information related to the products, prices and services of the catering enterprise in the restaurant. It not only includes various text and picture materials, audio-visual materials, models and physical materials, but also includes the order menu written by the waiter after the customer orders. The narrow menu refers to various printed materials prepared by catering enterprises to facilitate customers' ordering and ordering, which introduce the products, services and prices of the enterprise.