An information providing system includes a first portable terminal of a first visitor who visits a theme park and a server that communicates with the first portable terminal, in which the information providing system provides information on food provided in the theme park, the server includes a database in which an image of the food is associated with the information on the food, and when the first visitor takes a picture of food eaten by a second visitor and uploads the taken picture, the server specifies the food in the picture with reference to the database, and transmits the information on the specified food to the first portable terminal of the first visitor.