The invention provides a software development support system capable of reflecting the content added by a person to source code in source code generated again, without modifying design information. A generator 41 generates source code in which plural insertion markers are inserted on the basis of design information. An extracting portion 43 extracts code (inserted code) contained in a range specified by each insertion marker in source code. Each extracted inserted code is associated with its identification information and stored into a saving portion 32. When the generator 41 generates source code, a combining portion 44 performs a process of combining inserted code with the relevant source code and outputs the processed source code, wherein the relevant inserted code is included in plural pieces of inserted code stored in the saving portion 32, source code identified by the identification information for the relevant inserted code coincides with the relevant source code and an insertion marker identified by this identification information exists in the relevant source code and coincides with the relevant insertion marker.