The present disclosure includes a master device, a plurality of slave devices performing a communication through Profibus and a configuration tool providing network configuration information of Profibus DP by generating the network configuration information, wherein the configuration tool includes an automatic configuration module configured to request the master device of information relative to the plurality of slave devices in response to an automatic configuration command inputted through a user communication module, to receive the information and provide profiles of relevant types by determining the types of the plurality of slave devices using the received information, and a network configuration information configured to generate the network configuration information in response to the types and profiles determined by the automatic configuration module and to provide the network configuration information to the master device.