Photoinduccd phase transitions via excited electronic states are discussed theoretically using a minimal model composed of localized electrons and one-dimensional lattices under the adiabatic and diabatic approximations. We show that the global structural transition by photoexcitation only at a site is possible, and we clarify conditions for the occurrence of such cooperative phenomena. Spatiotemporal dynamics of nonequilibrium first-order phase transitions is also investigated in terms of the domino process in photoinduced nucleations.