Display apparatus and method for operating the same for protecting privacy

1. A method for operating a display apparatus, the method comprising:

acquiring biometric information about a user through a camera or a sensor unit;

comparing the acquired biometric information with pre-stored authentication information;

switching the display apparatus to a first mode, if the acquired biometric information does not match with the pre-stored authentication information, the first mode restricting access to content predetermined from total content;

switching the display apparatus to a second mode if the acquired authentication information matches with the pre-stored authentication information, the second mode allowing access to the total content;

displaying a notification message related to the predetermined content when the second mode is entered, the predetermined content generated during operation in the first mode;

displaying a notification pop-up indicating an item changed during operation in the first mode, when the second mode is entered;

receiving a command selecting a recover item included the notification pop-up; and

recovering the changed item to a previous state,

wherein the authentication information is information about an iris, and

wherein the recovering the changed item to a previous state comprises switching a current screen to another screen in which along with a graphic effect of creating a new application icon for a deleted application or returning a shifted application to the previous position, the changed item is recovered to a previous setting before entering the first mode.

2. The method according to claim 1 , wherein the predetermined content is switched to a hidden or locked state in the first mode.

3. The method according to claim 2 , wherein a notification message related to the content in the hidden state is not output in the first mode.

4. The method according to claim 1 , further comprising setting content for access restriction.

5. The method according to claim 4 , wherein the setting comprises displaying the access-restricted content differently according to the type of the access-restricted content.

6. The method according to claim 4 , further comprising, when a specific object is touched for a predetermined time or longer in the second mode, displaying a setting menu for content corresponding to the object.

7. The method according to claim 4 , further comprising:

displaying a plurality of icons and a setting menu on a display;

selecting at least one of the icons; and

selecting one item in the setting menu or dragging the selected icon to one item in the setting menu.

8. The method according to claim 7 , wherein icons that can be set for access restriction among the plurality of icons are displayed differently from the other icons.