Disclosed is a password input method employing a three dimensional number input method. The password input method employing a three dimensional number input method comprises: a) a step where an MCU (40) checks whether a touch pad or a button of a keypad unit (10) corresponding to each number is pressed; b) a step where the MCU (40) counts time during which the touch pad or the button of the keypad unit (10) is pressed while checking whether the touch pad or the button of the keypad unit (10) is released; c) a step where the MCU (40) recognizes a different value corresponding to a pressed time value from the number of the pressed button or touch pad when the touch pad or the button of the keypad unit (10) is released; and d) a step where the MCU (40) registers the button or the touch pad of the pressed number and a value corresponding to the pressed time value as a password, or compares the password with a preregistered password to control opening/closing of a door. A risk of password exposure can be reduced in a door lock system.;COPYRIGHT KIPO 2017
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