PURPOSE: A group synchronization method is provided to update data of one embedded system, and then get the data automatically updated at the other embedded systems when plural embedded systems are driven. CONSTITUTION: The method comprises several steps. A daemon program calls embedded systems within a shared group when synchronization data is changed at one embedded system or it comes to a synchronization time(S101). The embedded system in access to a host computer transmits the changed data to the host computer(S102). The host computer detects embedded systems, which are allowed to be synchronized, within the current shared group(S103), and transmits the changed data to the detected embedded systems(S104).
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