An image processing apparatus includes: a processor; a first interface that acquires information for user authentication; a second interface that acquires information for user identification; and a memory that stores a customization information table defining information for customizing an operation screen displayed on the first interface. The processor displays: when the first interface acquires the information for the user authentication, an operation screen customized, using the customization information table, for a user authenticated through the user authentication as the operation screen, and when the first interface does not acquire the information for the user authentication, an operation screen customized, using the customization information table, for a user identified by the information acquired by the second interface as the operation screen.