An internet service server transmits an information link mail to a cellular phone through a cellular phone mail server. If the received e-mail is an information link mail, the cellular phone transfers it, for example, to a navigation apparatus. Upon receipt of the information link mail, the navigation apparatus starts a predetermined application and provides a service to a user. The cellular phone may start a predetermined application and store predetermined information in the cellular phone. The cellular phone can communicate with an authentication apparatus through a wireless tag reader. The authentication apparatus checks predetermined information and performs authentication as a result of the check.