Electronic device and device management system

A device management system, comprising:

• one or more electronic devices;
• a mediation device communicably connected to the one or more electronic devices through a first network;
• a management device communicably connected to the mediation device through a second network and configured to collect usage information indicating usage of each of the one or more electronic devices via the mediation device,
• each of the one or more electronic devices including:
• a processor configured to
• generate the usage information according to use of the electronic device,
• communicate with the mediation device communicably connected to the electronic device through the first network, and
• transmit to the mediation device the generated usage information when the electronic device is communicably connected to the mediation device through the first network;
• and
• a memory configured to store the generated usage information when the electronic device is disconnected from the mediation device,
• wherein the processor transmits the usage information stored in the memory to the mediation device when the electronic device reconnects to the mediation device.