c s 103 which is entitled to receiving the service in the url notification device 10 since a sequence of telephone numbers of a portable telephone can generally identify the carrier whom the portable telephone belongs to a sequence of telephone number b are only to be recognized to be determined whether the portable telephone belongs to the carrier c to acquire the caller telephone number b the caller telephone number notification function of the portable telephone may be also used when the portable telephone of the originator is configured not to notify the caller telephone number such an automatic voice message as u201c please call again after turning on to set the caller telephone number notification u201d is sent through the line interface 18 to the portable telephone by the responder 22 to urge the user to notify the caller telephone number and then the telephone line is disconnected when it is determined that the above acquired caller telephone number b is the number belonging to the carrier c the service telephone number a is then acquired as the next process s 104 however when it is determined that the caller telephone number b is the number of a portable telephone belonging to a carrier other than the carrier c such an announcement for rejection as u201c sorry but please call again with a portable telephone of the carrier c u201d is sent to the portable telephone s 107 and then the telephone line is disconnected s 108 to finish the.