Abstract: A theme changeable mouse for automatically matching network communities is provided and can automatically match and link users of individually customized theme website communities by built-in IDs (identifications). The mouse includes a theme cover and a mouse base. The theme cover can be optionally matched and changed, while each of the theme cover has the IDs therein. A recognition processing unit of a control circuit firmware on a printed circuit board in the mouse base is used to execute a recognition process, so that the user can automatically log into a specific website for providing advanced information service if the user is matched.