Abstract: With employment of an information processing apparatus including a display apparatus, and for executing and debugging a program in an interactive mode, the program is debugged in such a manner that when the program is executed, both a calling relationship between each of modules and an execution history therebetween are sequentially stored, and the dependent relationship between the respective modules (module relation diagram) represented by a tree structure, the execution history of the respective modules, and a source program are displayed. Furthermore, a discriminative display is made to the module which is being executed or in which an error occurs on the module relation diagram, and also a statement source program. In addition, both the module relationship diagram and the module execution history as corresponding with each other an be displayed.