Menu originally refers to the list of dishes provided by restaurants. Now it refers to the list of options that appear on the display screen during the operation of computer programs, and also refers to the list of various service items, which has a wider meaning. The menu in a broad sense refers to all the information related to the products, prices and services of catering enterprises in the restaurant, including not only all kinds of words, pictures, audio-visual materials, models and physical materials, but also the menu written by the waiter after the customer orders. In a narrow sense, the menu refers to all kinds of printed materials prepared by catering enterprises to introduce their products, services and prices for the convenience of customers.