An apparatus migrates and/or converts any source application working on any platform into a format of any target platform. It comprises an inputting means for accepting the entire source code of sample part in ASCII to analyze the business logic of the source application and corresponding data; an analyzing means for analyzing the source schemes; a setting up means for generating (updating or creating) custom knowledge base; a processing means for conversion of source code in format of target specification; and A documenting means for generation of reports during review of the process stage and a summary report after the end of the conversion process, which consists of the code that is not converted automatically.