A prepaid system (100, 1200), comprising: a prepaid deposit management server (104, 1204) configured to manage an amount of money deposited in advance by a communication terminal (102, 103, 1202, 1203) by receiving a request including a prepaid number type corresponding to a predetermined amount of money from the communication terminal, and sending a prepaid number request including the prepaid number type when the deposited amount of money is greater than the predetermined amount of money; a prepaid number responding unit (114, 1214) configured to receive the prepaid number request from the prepaid deposit management server, select a prepaid number corresponding to the prepaid number type in the prepaid number request from a database storing multiple prepaid numbers, and send the selected prepaid number to the prepaid deposit management server; and a charge system (122, 1226) configured to charge for a communication made by the communication terminal, wherein the prepaid deposit management server receives the selected prepaid number from the prepaid number responding unit and subtracts the predetermined amount of money from the deposited amount of money of the communication terminal (102, 103, 1202, 1203), characterised by a prepaid charge unit (120, 1220); wherein the prepaid deposit management server sends a URL of the prepaid charge unit including the received prepaid number to the communication terminal to enable the communication terminal (102, 103, 1202, 1203) to access the prepaid charge unit (120, 1220) using the URL including the prepaid number received from the prepaid deposit management server to pay a communication charge of the communication terminal (102, 103, 1202, 1203); and wherein the prepaid charge unit determines whether the prepaid number is valid based on whether status data of the prepaid number are assigned and not used, and when the prepaid number is valid, causes the charge system to subtract the predetermined amount of money corresponding to the prepaid number from the communication charge of the communication terminal. a prepaid deposit management server (104, 1204) configured to manage an amount of money deposited in advance by a communication terminal (102, 103, 1202, 1203) by receiving a request including a prepaid number type corresponding to a predetermined amount of money from the communication terminal, and sending a prepaid number request including the prepaid number type when the deposited amount of money is greater than the predetermined amount of money; a prepaid number responding unit (114, 1214) configured to receive the prepaid number request from the prepaid deposit management server, select a prepaid number corresponding to the prepaid number type in the prepaid number request from a database storing multiple prepaid numbers, and send the selected prepaid number to the prepaid deposit management server; and a charge system (122, 1226) configured to charge for a communication made by the communication terminal, wherein the prepaid deposit management server receives the selected prepaid number from the prepaid number responding unit and subtracts the predetermined amount of money from the deposited amount of money of the communication terminal (102, 103, 1202, 1203), characterised by a prepaid charge unit (120, 1220); wherein the prepaid deposit management server sends a URL of the prepaid charge unit including the received prepaid number to the communication terminal to enable the communication terminal (102, 103, 1202, 1203) to access the prepaid charge unit (120, 1220) using the URL including the prepaid number received from the prepaid deposit management server to pay a communication charge of the communication terminal (102, 103, 1202, 1203); and wherein the prepaid charge unit determines whether the prepaid number is valid based on whether status data of the prepaid number are assigned and not used, and when the prepaid number is valid, causes the charge system to subtract the predetermined amount of money corresponding to the prepaid number from the communication charge of the communication terminal.