The possibility to construct the molecular assembly in a nanoscopic scale and with novel electric functions is discussed based on recent STM (scanning tunneling microscopy) and in-situ X-ray diffraction studies on the organic evaporated films. It is suggested that the nanoscopic operation with a STM tip can be utilized to change ethylene structure into acetylene structure, inducing the insulator-conductor transformation and to construct organic superlattice by arranging the molecules at the desired positions. In addition, the nanoscopic manipulation of each polar molecule will become possible by imposing an electric field to the STM tip. Furthermore, the suggestion is made that the molecular assembly with a super structure, which contains uniaxially oriented electric dipoles and exhibit piezo-, pyro- and ferroelectric activities, can be created by fabricating two kinds of non-polar molecular layers.