The present invention relates to a device management system including a peripheral device, a management server configured to manage device information of the peripheral device, and a terminal communicable with the management server. In the device management system, the management server registers key obtaining information received from the terminal while associating the key obtaining information with device identification information of the peripheral device and an authentication key managed by the management server. The management server determines whether the key obtaining information, from the terminal, that is registered while being associated with the device identification information contained in an obtaining request received from the peripheral device matches the key obtaining information contained in the received obtaining request.