An image processing apparatus comprises: a display that displays a first screen including one or more than one first key for setting a mode to execute a function of the apparatus, and then, if one of the first keys is pressed, displays a second screen including one or more than one second key, which is a lower-class screen under the pressed first key; and a customizing portion that hides at least one of the first and the second keys on the first screen, according to a user operation, and wherein if a user changes to non-display, the setting of at least one of the first keys on the first screen, while there exists a second key preliminarily prohibited from being hidden, on the second screen that is a lower-class screen under the first key to be hidden according to the changed setting, the customizing portion doesn't hide the first key.