10. A document input and output device with a security protection function, the document input and output device being connected to a network and using a plurality of communication protocols, the document input and output device communicating documents in various data forms with plural information devices, comprising: setting means configured to set a security protection setting; protection means configured to provide security protection for the document that is input, the protection means being configured to convert the document into a document having limited functions based on the security protection setting; and confirmation means configured to request confirmation of information that is input by a user, wherein the confirmation means requires address information that is directly input to be input again, wherein a document input and output process is performed to convert the input document into the converted document, and the converted document is protected, wherein in the case of directly inputting an address of a destination where the document is to be transmitted, a screen for requesting a user to input the address again for confirmation is displayed to the user based on the security transmission setting, and wherein the screen for requesting the user to input the address again for confirmation is displayed in succession to a display of the screen where the address is directly input in the case of directly inputting the address.
10. A document input and output device with a security protection function, the document input and output device being connected to a network and using a plurality of communication protocols, the document input and output device communicating documents in various data forms with plural information devices, comprising: setting means configured to set a security protection setting; protection means configured to provide security protection for the document that is input, the protection means being configured to convert the document into a document having limited functions based on the security protection setting; and confirmation means configured to request confirmation of information that is input by a user, wherein the confirmation means requires address information that is directly input to be input again, wherein a document input and output process is performed to convert the input document into the converted document, and the converted document is protected, wherein in the case of directly inputting an address of a destination where the document is to be transmitted, a screen for requesting a user to input the address again for confirmation is displayed to the user based on the security transmission setting, and wherein the screen for requesting the user to input the address again for confirmation is displayed in succession to a display of the screen where the address is directly input in the case of directly inputting the address. 14. The document input and output device as claimed in claim 10 , wherein, after a key operation of a last input screen, the confirmation means displays a confirmation screen for requesting confirmation and then returns to a screen before the key operation.