disclosed is a method of informing charging data to a mobile terminal in a code division multiple access type or time division multiple access type mobile radio communication system which enables a mobile terminal subscriber to immediately confirm the telephone charges of the mobile terminal . according to the method , a mobile communication exchange detects the termination of a telephone call by the mobile terminal , and the mobile communication exchange produces charging information for the telephone call and informs the charging information to a charging center . the charging center in turn calculates the telephone charge using the charging information received therein and informs the calculated telephone charge to the mobile communication exchange , and the mobile communication exchange transmits the telephone charge information to the mobile terminal .