It is important to understand the operation process of the algorithm when a program is studied and
debugged. We can use a debugger for this purpose. However, it is not easy to understand the
operation process of the algorithm intuitively, by getting numerical information obtained from the
debugger. On the other hand, when we understand the algorithm from using diagram such as
flowchart, it is difficult to grasp the states of variables.
In this paper, we developed an all-purpose visualization system of algorithm to support the
debugging and the study of beginner’s programming;we can easily visualize the operation process of
the algorithm and grasp the states of variables. We proposed some devices to visualize easily the
operation process of the algorithm:to display a tree-structure among functions,to indicate compactly
the flowchart by a case, and to make a graph of the states of variables.