1. A distributed network management system for a vehicle, the distributed network management system being disposed on a plurality of electronic control units that are inter-connected by a distributed network, wherein each of the electronic control units is selectable as a leading node or an idle node in the distributed network, the distributed network management system comprising: a plurality of data configuration modules, wherein each of the data configuration modules is disposed on each of the electronic control units, and each of the data configuration modules is configured for performing a re-configuring action to a plurality of network messages; a plurality of data definition modules, wherein each of the data definition modules is disposed on each of the electronic control units and is connected to each of the data configuration modules, and each of the data definition modules is configured for performing a pre-defining action corresponding to the network messages; a plurality of distributed node status broadcast modules, wherein each of the distributed node status broadcast modules is disposed on each of the electronic control units, and each of the distributed node status broadcast module is configured for selecting one of the electronic control units to perform a task assigning action; a plurality of task transformation modules, wherein each of the task transformation modules is disposed on each of the electronic control units, and each of the task transformation modules is configured for selecting one of the electronic control units to perform a task transferring action; a plurality of task overload modules, wherein each of the task overload modules is disposed on each of the electronic control units, and each of the task overload modules is configured for selecting one of the electronic control units to perform a task overloading action; and a plurality of task load balance modules, wherein each of the task load balance modules is disposed on each of the electronic control units, and each of the task overload modules is configured for selecting one of the electronic control units to perform a task load balancing action; wherein the electronic control unit selected as the leading node performs the task assigning action to order the other of the electronic control units through one of the distributed node status broadcast modules; when one of the electronic control units is failed and cannot perform any tasks, the electronic control unit selected as the leading node performs the task transferring action, the task overloading action and the task balancing action to order the the electronic control unit selected as the idle node to perform the tasks of the failed electronic control unit through the task transformation modules, the task overload modules and the task balance modules of the electronic control unit selected as the leading node.