To attain a speech through the Internet by selecting a provider whose utility charge is small and dialing it even in the case of movement in a coverage area without individual contract with a provider.

An identification code assigned to a card C and a provider list 2 where access codes 21b-21d to a provider that makes connection service to the Internet are registered in a service area 21a to which an Internet telephone set is placed are at least stored. Moreover, preferably a card password used to the Internet telephone set assigned to each card C is stored.