Abstract: An error guide offering method of an image forming apparatus which includes a display unit to display a user interface (UI) offering an error guide to an error, the method including: detecting the error from the image forming apparatus; determining whether the error occurs from a plurality of locations; determining whether error guides to the error occurring from the plurality of locations have a common procedure; displaying a first error guide to a first error; displaying a second error guide to a second error instead of returning to a standby mode upon a completion of the processing of the error according to the first error guide; processing the second error according to the second error guide, the displaying the second error guide including displaying a common procedure in the first and second error guides. With this, an error guide integrating a common procedure to a plurality of errors occurring from the image forming apparatus efficiently processes the error and reduces waste of time.

Abstract: A method of setting a display mode in an image forming apparatus connected to an external apparatus via a network includes logging in to the image forming apparatus, authenticating log-in information according to the logging in at the image forming apparatus, displaying a document box and file stored in the image forming apparatus on a display unit according to the set display mode in accordance with a user corresponding to the authenticated log-in information, and selecting one of the displayed document box and file.