Disclosed is a method of informing charging data to a mobile terminal in a code division multiple access (CDMA) type or time division multiple access (TDMA) 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.