To provide a credit guarantee system capable of granting credit to a fictitious name of a user who uses a network and suppressing the situation requiring to disclose personal information, etc.SOLUTION: A credit guarantee system (1) in the present invention is a credit guarantee system (1) for granting credit to a fictitious name, and comprises a user device (10) for a user desiring the use of a fictitious name capable of connecting to a network, a provider device (20) for a provider who guarantees credit of a fictitious name capable of connecting to a network and registering a fictitious name of a user, and a third-party device (30) capable of connecting to a network and communicating with the user device (10) and the provider device (20). The provider device (20), when receiving a communication of the third-party device (30) requiring a guarantee communication to guarantee credit from the user device (10), performs a guarantee notification that the fictitious name has been confirmed of credit to the third-party device (30).SELECTED DRAWING: Figure 1
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