The goal of this study is developing the new software for creating interactive virtual environments of machine-maintenance training using virtual reality technology. The problem of existing virtual reality softwares is that special knowledge is needed in order to create interactive virtual environments where a user can assemble and disassemble virtual apparatus. Therefore this paper presents a new interface in which a user intuitively creates interactive virtual environments by attaching ActCube, which is a rectangular parallelepiped with a peculiar function, to 3D model as like building blocks.