10. The flowchart editor of claim 1 wherein the branching node in the equivalent tree diagram comprises a sequence logic structure type branching node, a split logic structure type branching node, and loop logic structure type branching node.
10. The flowchart editor of claim 1 wherein the branching node in the equivalent tree diagram comprises a sequence logic structure type branching node, a split logic structure type branching node, and loop logic structure type branching node. 12. The flowchart editor of claim 10 wherein the loop logic structure comprises WHILE loop logic structure and UNTIL loop logic structure, correspondingly said loop logic structure type branching node comprises WHILE loop logic structure type branching node and UNTIL loop logic structure type branching node.