This paper describes a physical model of elementary particles based on the wave features of their behav-ior. Elementary particles are regarded as dynamical structures of the micro-world, interrelated with all levels of the Universe; i.e., inseparable from the structure of the Universe as a whole. Between any elementary particles and the ambient field of matter-space-time, as well as between elementary particles themselves, there exists an interchange of matter-space-time occurring both in horizontal (within the same level) and vertical (between dif-ferent levels) directions. This model reveals the nature of mass and charge of elementary particles, which in turn leads to the unified description of fundamental (electromagnetic, gravitational,...