A system development device includes a storage unit that stores therein an object information list, in which an entry is registered for each constituent element that constitutes a single control system, where the entry includes an object type of a constituent element, includes connection information, and includes setting information; a system-configuration displaying and editing unit that generates a workspace display screen for each object information list, where the workspace display screen connects and displays, a display object according to the object type of each entry registered in the object information list; and a dividing unit that, when the system-configuration displaying and editing unit receives a dividing command designating any second system included in a first system, duplicates an entry of the second system that is registered in a first object information list of the first system and that generates a second object information list.