To provide a printer for reducing the load of a user by simplifying an authenticating operation by the user in restricting printing.

A composite machine 20 stores the driver program of the composite machine 20 to be transmitted to a terminal connected through a network and a driver code to be added to this and authentication information to be used for access authentication to the composite machine 20. When receiving the transmission request of the driver program from the terminal, the composite machine performs authentication by using the authentication information, and transmits the driver program to which the driver code has been attached to the terminal only when the authentication is successful. When printing is requested from the terminal to the composite machine 20, the driver program transmits print data including the driver code to the composite machine 20 without making it unnecessary for a user to input the authentication information. The composite machine 20 determines the permission/inhibition of printing based on the driver code included in the print data received from the terminal and the driver code stored in itself for restricting printing.

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