This method uses first and second access devices to record configuration data of electronic devices, a weight calculation module to determine a priority index for each electronic device based on its usage status, a proxy designation module to compare the priority indices and designate an electronic device having the highest priority index as a proxy. Therefore, by sharing configuration data and evaluating priorities, one of the electronic devices also functions as the proxy to automatically manage data flow between the electronic devices, avoiding the use of externally added dedicated management devices. The exchanged data may be encrypted by an encryption unit.