The attempt to utilize the Basic Resident Registers’ Network ended in failure. We should not repeat this failure with the My Number system. First of all, every effort should be made to protect personal information. Next, it is necessary to gain widespread acceptance of the system by achieving “overwhelming usefulness” by connecting various pieces of information. It is also necessary to fundamentally change the high-cost structure of the administrative services. To fulfill these objectives, the following are necessary: 1) comprehensiveness, by including all administrative services, 2) convenience, by computerizing administrative services, 3) expandability to the private and corporate sectors, and 4) integration of national, dō, and basic municipal governments using cloud services.