Personal data recording device, personal data transaction method, personal data transaction system, and program thereof

摘要

Purchase history data is held in a personal data recording device that includes a first recording region for recording credit data, a second recording region for recording purchase history data, and a third recording region for recording personal data. The service user records his own personal data in the third recording region, and when the user purchases merchandise, a credit transaction is performed by referring to credit data recorded in the first recording region. During the transaction, history data regarding the transaction is recorded in the second recording region. The user can sells the purchase history data and the personal data respectively recorded in the second and third recording regions.