The World Wide Web(WWW) has been regarded as a one of the important information databases. We are able to obtain much information from WWW using search engines and understand some knowledge. However, it is difficult to understand a huge amount of knowledge in a short time only using the search engines. We propose an animation interface to support for knowledge reconfirmation. We defined the knowledge as differences between keyword relationships. The interface has three functions: (1) displaying a map of keyword relationships, (2) switching maps depending on viewpoints and (3) displaying an animation between the two maps. Experimental results showed that the interface is able to support for knowledge reconfirmation.