Abstract: The present invention provides an embedded system design device and a method thereof using a target independent model comprises: a target independent model expressed in UML diagram type as a resource; a target independent model definition language for expressing the target independent model in language type; a profile where specific data for substantially controlling a particular embedded system is stored; a middle language configured by inserting contents of the profile into the target independent model definition language; a conversion language configured in the same linguistic type as the middle language, and for adding new data which does not exist in the middle language, or for changing particular contents; a target dependent model definition language generated by applying the conversion language to the middle language; and a modeling tool for performing a series of processing procedures of writing a diagram by using a UML (Unified Modeling Language), providing an interface tag which suggests resource it