A personal information verification system using an intermediary server and a settlement institution server, where personal information with an electronic signature, showing a desired purchase and a first version of item hash information are received from a person terminal. Then, the intermediary server generates a second version of item hash information by hiding the purchase item and adding an electronic signature, and transmits the second version of the item hash information to the settlement institution server. The settlement institution server sends a payment bill to a seller, generates the third version of the item hash information, and transmits the third version of the item hash information together with the amended personal information. The intermediary server generates a fourth version of the item hash information and transmits the personal information and the first to fourth versions of the item hash information to the seller terminal.