To make it possible to access an arbitrary site by continuously using telephone-identification information when the arbitrary site is accessed using any of the pieces of telephone-identification information corresponding to a plurality of telephone numbers as information on an access source.

In a mobile terminal device that a plurality of "telephone numbers" as subscriber numbers and a "stationary ID" which is assigned fixedly beforehand corresponding to each telephone number are stored and managed in a telephone number table 21, a CPU1 registers the "stationary ID" used when this site is accessed corresponding to this "URL", when directed the "URL" of this site be registered into a favorite table 22 in case that the arbitrary site is accessed as an access source information using any "stationary ID". Then, when the access of this registration site is directed, this site is accessed using the "URL" and the "stationary ID" which are corresponded with this registration site.

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