To provide a combined device efficiently registering authentication information used for authentication processing.

When it is determined that correct personal information is displayed in a text box of a combo box (S105), character strings in the corresponding text box are acquired (S106). When it is determined that correct personal information is not displayed in the text box of the combo box and it is determined that correct personal information is displayed in the corresponding list box (S107), any of the character strings displayed in the list box is acquired (S108). When it is determined that correct personal information is not displayed in the list box, the character strings corresponding to the correct personal information are inputted. The character strings acquired in steps S106 or S108 or the character strings (personal information) inputted in a step S109 are registered in a database for authentication as authentication information (S110).