Patent ID: 7573991

Claim:
A Communication control system interposed between a mobile communication terminal as a caller terminal and exchanges of a plurality of international communication companies, comprising: balance storage means for storing an amount of prepaid money of the caller together with the caller number of said mobile communication terminal; charge storage means for storing the charge system of each said international communication company; balance checking means for checking the balance of the prepaid money of said caller by searching said balance storage means with the caller number automatically sent from the exchange belonging to a public line network as a key when a connection is made from said caller terminal to the telephone line of the communication control system; call permission determining means for determining the permission of a call of said caller based on the balance; communication company specifying means for recording the charge systems of the plurality of international communication companies and for specifying one international communication company among the plurality of international communication companies; speech permissible time calculating means for calculating a speech permissible time by applying the number of the called terminal inputted from the caller terminal and the balance of the prepaid money to the charge system of said international communication company; line connecting means for connecting the caller terminal with the called terminal via an exchange of said international communication company; speech time measuring means for measuring the speech time between said caller terminal and said called terminal; line disconnecting means for disconnecting the speech channel between the caller terminal and the called terminal at the moment of time when the speech permissible time passes; telephone charge calculating means for calculating the telephone charge by applying said speech time to the charge system of said international communication company; and balance updating means for subtracting said telephone charge from the balance of the prepaid money of said caller within said balance storage means; said communication control system being characterized in that different telephone lines are allocated to each of said plurality of international communication companies in advance of said communication company specifying means specifies one international communication company by the telephone line to which a connection is made from said mobile communication terminal to this communication control system.