There is provided a device management system. In the system, a first communication device sends a device ID and an owner identifier to a device management apparatus, and receives a first confirmation code. The device management apparatus receives the device ID and the owner identifier, generates the first confirmation code and provisional registration information, records the received and generated information items, sends the first confirmation code to the first communication device, and sends the provisional registration information to a second communication device. The second communication device receives the provisional registration information, obtains a second confirmation code, and sends the second confirmation code to the device management apparatus. The device management apparatus receives the second confirmation code, and records registration completion information if the second confirmation code matches the corresponding first confirmation code.