COMMUNICATION SERVICE PROVIDING SYSTEM AND USE IN-ADVANCE SERVICE PROVIDING METHOD THEREOF

摘要

A use in-advance service providing method of a communication service providing system comprises the steps of: adding a predetermined amount of data to a data allowance of a first period, on the basis of a use in-advance request from a user; recording the predetermined amount of data in a use in-advance data record; generating at least a part of the data amount recorded in the use in-advance data record as data usage amount information, when a second period following the first period starts; and subtracting the data amount contained in the data usage amount information from the data allowance of the second period.