A prepaid card management method and system which can comprehensively manage an issuance of personal identification numbers (PINs) of various affiliated prepaid card companies and even when each generation system of each PIN is different for each affiliated prepaid card company, can adaptably issue the PIN. A prepaid card management method and system according to the present invention can adaptably issue PINs of prepaid cards of various affiliated prepaid card companies by including an operation system to comprehensively manage a plurality of PIN issue systems.