Electronic device for performing authentication using multiple authentication means and method for operating the same

An electronic device, comprising:

• a first sensor;
• a second sensor;
• a memory configured to store reference biometric information;
• and
• a processor configured to:
• obtain, via the first sensor, first biometric information, the first biometric information corresponding to a first authentication level,
• perform authentication by comparing at least one piece of the reference biometric information with the obtained first biometric information while the electronic device operates in a locked state,
• based on a determination that the authentication fails consecutively more than a designated number of times, activate a timer set to a designated time, wherein the first sensor is not accessible for performing authentication while the timer is activated,
• obtain, via the second sensor, second biometric information while the timer is activated, the second biometric information corresponding to a second authentication level, and
• when the second biometric information is authenticated by comparing at least one piece of the reference biometric information and the obtained second biometric information:
• deactivate the timer if the second authentication level is lower than the first authentication level, and switch the electronic device from the locked state to an unlocked state if the second authentication level is equal to or higher than the first authentication level.