PURPOSE: To simplify preparation work for testing a formed program.

CONSTITUTION: This testing program forming system is constituted of a variable specifying file 2 for specifying a variable to be traced, a testing source file 3, a trace source forming processing part 6 for forming a tracing sentence, a trace source table 4 for storing the tracing sentence, an original source I/O processing part 5 for reading a program to be tested and outputting the read program as a testing source, a variable name retrieving processing part 7 for retrieving a variable to be traced from the program to be tested, and a trace source output processing part 8 for outputting the tracing source to the testing source.