According to embodiments, a robot system configured to determine a recipe from an ingredient list obtained by detecting a type and an amount of an ingredient includes: a storage table configured to detect a weight change by a scale installed under each of cells that store ingredients according to types of the ingredients, detect the cell of which a weight is changed according to an ingredient selection of a user to identify the type of the ingredient, and identify the amount of the ingredient based on a degree of the weight change of the cell; and a robot configured to receive the ingredient list obtained from the type and the amount of the ingredient identified by the storage table from the storage table, retrieve menus to be cooked with the ingredient list, and perform cooking by determining the recipe according to a menu selected from the menus.