It is difficult for beginner programmers imagine how a program does behave. The authors focused on the reasons for the same, viz. the fact that beginners are not able to create appropriate image of the behavior of a program including the combination of control statements (e.g. if-statement, while-statement, switch-statements, etc) and/or program function. Therefore they developed such an environment that it is easy for beginners to understand the above-mentioned program. In the present paper, they have shed light on the details of the tool and they have also verified its effectiveness by an experiment.