Abstract: A personal information management system includes: a blockchain server configured to store a blockchain including, for each block, a transaction and a transaction ID for identifying the transaction; and a personal information management apparatus configured to access the blockchain server, wherein the personal information management apparatus is configured to store a second piece of personal information on an individual, which accompanies a first piece of personal information for identifying the individual, in association with a first transaction ID received from the blockchain server, and wherein the blockchain server is configured to generate the first transaction ID, generate a first block including a first piece of converted data which is based on the first piece of personal information and the first transaction ID, add the first block to the blockchain, and transmit the first transaction ID to the personal information management apparatus.