Operating method of an iris sensing portable device and iris sensing portable device

The driving method of the iris recognition mobile device with a first user who is a registered user while staring at the iris mobile device, recognizing the proximity of the other second user to the first user, the proximity of the second user recognition If, when the step of recognizing an iris of the second user check the register whether the second user and the second user identified by the unregistered user, the method comprising: displaying a display portion locks the screen of the iris portable device It includes. Thus, the iris mobile device can be prevented, leakage of personal information by having the iris recognition camera to recognize the iris of the other.