1. An information transmission apparatus comprising: registration means which can register information of plural information destinations, including address information; display means which can display information of the plural information destinations registered in said registration means, in response to a request from a user; transmission destination designation means which can designate an information destination of information from the plural information destinations displayed by said display means; information transmission means which executes an information transmission to the information destination designated by said transmission destination designation means; user authentication means which specifies a user; and address information concealment means which executes a display in a state where the address information is concealed, in case an information display for the information destination registered in said registration means is requested from a user not authenticated by said user authentication means; wherein said transmission destination designation means is capable of designating the information of the information destination, displayed in the state where the address information is concealed by said address information concealment means, as the information destination of the transmission by said information transmission means.