A user interface is controlled to support a user using an image processing apparatus which can perform a task, for example, for storing image data obtained by a scanner in a memory or printing the image by a printer. In a display apparatus which can display a user interface including operation items, a user's intention is estimated, and an operation by the user for specifying a task is supported. For example, statuses of an image input unit and an image accept unit relating to execution of the task are monitored, and display forms of the operation items are varied in accordance with results of the monitoring.