The present invention relates to a method for inputting a password into an electronic terminal, wherein the method comprises: a step of saving a password character string inputted by the user through an input unit in a storage unit; a step of randomly placing adjacent characters from within the password character string into adjacent input buttons—defined as any two input buttons connected in a straight line without passing another input button—which are arranged in a two-dimensional field by a control unit, wherein the total number of input buttons is greater than the number of characters included in the password character string; a step in which the control unit places a character not included in the password character string into an input button in which a character included in the password character string has not been placed; a step in which a display unit displays each input button displaying a placed character; a step in which an input unit receives the input character string from the user; and a step in which the control unit completes the user authentication procedure when the password character string and the input character string are the same.