This article presents a design of educational software employing group competition using a large interactive electronic whiteboard, and a report on its experimental use. Group competition and collaboration are useful methods to cultivate originality and communication skills. To share the same space, the same large screen, and face-to-face communication with others is very important in a group competition. By employing a large interactive electronic whiteboard, we can also introduce the benefits of IT into this environment. We have designed a group competition application, i.e., Kanji pairing software using an interactive electronic whiteboard. Through experimental use of the application at two elementary schools, we confirmed the necessity of selecting competitive elements according to the children's personalities, the teacher's leadership style, as well as the potential to motivate children to learn. Moreover, the children kept their concentration and the teacher grasped children's study processes. Therefore, we have found that an interactive electronic whiteboard and group competitive software can be effectively employed in classroom learning. (Contains 1 table and 4 figures.)