Provided are a method and system for providing cooking information about food. The method includes receiving, from a camera, an ingredients image of at least one ingredient on a plate; determining the at least one ingredient based on the ingredients image; determining a food recommendation list related to the at least one ingredient, based on user information about a user of a mobile device; obtaining cooking information about food that is selected from the food recommendation list; and providing the cooking information to a projector that is connected to the mobile device, wherein the cooking information is projected, via the projector, onto the plate on which the at least one ingredient is disposed.