An efficient system to support referencing external information is proposed. External information is information that is not displayed in the original work but is related to work. We employ an annotation system to display information to the user. We are developing Wappen (Web-based Annotation Appending and Sharing Framework) to provide annotation of any scene on a primary terminal, and reference prepared scene annotations on a secondary terminal (when the user is viewing a scene on the primary terminal). Experimental results indicate that the time required to obtain the desired information by viewing annotations using two terminals is less than that using a single terminal. The results of a subjective evaluation show that using two terminals obtained higher evaluation than using a single terminal.