An image processing apparatus is provided that is capable of displaying a customized screen without requiring direct input operations to the image processing apparatus. The image processing apparatus (for example, a multi-function peripheral, or MFP) is communicably connected to an information processing apparatus (for example, a personal computer, or PC) and includes a displaying portion. The MFP acquires user information related to a login user who logs in to the PC, authenticates based on the acquired user information to determine whether the login user is a usage permitted user who is permitted to use the MFP, and displays a customized screen corresponding to the login user on the displaying portion of the MFP when the login user is authenticated as the usage permitted user.