Prepaid system, method thereof, and communication terminal

A prepaid deposit management server for managing a deposit of a communication terminal, comprising:

• a request receiving unit configured to receive a first request from the communication terminal for obtaining a prepaid number related to a predetermined amount of money;
• a request transmitting unit configured to transmit a second request to a prepaid number management unit for being transmitted the prepaid number, said prepaid number management unit being configured to manage a plurality of prepaid numbers;
• a prepaid number receiving unit configured to receive the prepaid number from the prepaid number management unit when the deposit of the communication terminal is greater than the amount of money related to the prepaid number;
• and
• a prepaid number transmitting unit configured to transmit the prepaid number received from the prepaid number management unit to the communication terminal.

A method of a prepaid system including a prepaid deposit management unit configured to manage a deposit of a communication terminal, a prepaid number management unit configured to provide a prepaid number for the prepaid deposit management unit, and a prepaid charge unit configured to authenticate the prepaid number;

• comprising the steps of:
• the communication terminal making a first request to the prepaid deposit management unit for being provided with a prepaid number related with a predetermined amount of money;
• the prepaid deposit management unit making a second request to the prepaid number management unit for being provided with the prepaid number related to the amount of money in response to the first request;
• the prepaid number management unit, in response to the second request, transmitting a prepaid number as the requested prepaid number to the prepaid deposit management unit based on a result of a comparison between the deposit of the communication terminal and the amount of money related to the prepaid number;
• the prepaid deposit management unit transmitting the prepaid number transmitted from the prepaid number management unit to the communication terminal;
• the communication terminal sending the prepaid number transmitted from the prepaid deposit management unit to the prepaid charge unit to pay for a communication charge of the communication terminal;
• the prepaid charge unit authenticating the prepaid number sent from the communication terminal, and transmitting data of the authenticated prepaid number to a charge system, said charge system calculating the communication charge based on the amount of money related to the authenticated prepaid number.

A method of a prepaid deposit management server for managing a deposit of a communication terminal, comprising the steps of:

• receiving a first request from the communication terminal for obtaining a prepaid number related to a predetermined amount of money;
• transmitting a second request to a prepaid number management unit for being transmitted the prepaid number, said prepaid number management unit being configured to manage a plurality of prepaid numbers;
• receiving a prepaid number as the requested prepaid number from the prepaid number management unit when the deposit of the communication terminal is greater than the amount of money related to the prepaid number;
• and
• transmitting the prepaid number received from the prepaid number management unit to the communication terminal.

A prepaid system, comprising:

• a user data base storing a plurality of identification numbers of a plurality of communication terminals, and a plurality of prepaid counts each being convertible into a communication charge, each of said identification numbers being made in correspondence with one of said prepaid counts;
• a prepaid charge unit configured to modify a value of a prepaid count in the user data base;
• and
• a first charge system configured to calculate a communication charge of a communication terminal and request the communication terminal to pay for the communication charge, wherein
• the prepaid charge unit modifies a value of a prepaid count of a first communication terminal when the first communication terminal requests to assign at least a part of the prepaid count of the first communication terminal to a second communication terminal specified by the first communication terminal;
• and
• the first charge system decreases a communication charge of the second communication terminal by subtracting said at least a part of the prepaid count from the communication charge of the second communication terminal when requested by the prepaid charge unit.

A prepaid method, comprising:

• a first step of transmitting a request to a second communication terminal for assigning at least a part of a prepaid count of a first communication terminal to the second communication terminal specified by the first communication terminal, said prepaid count being convertible into a communication charge, and a plurality of said prepaid counts being stored in a user data base in correspondence with a plurality of identification numbers of a plurality of communication terminals;
• a second step of modifying a value of the prepaid count of the first communication terminal in the user data base in response to the request;
• and
• a step of requesting a first charge system to decrease a communication charge of the second communication terminal by subtracting said at least a part of the prepaid count from the communication charge of the second communication terminal, said first charge system being configured to calculate a communication charge of a communication terminal and request the communication terminal to pay for the communication charge.