To improve the rigidity, durability, waterproof, fire resistance, rust preventive property, heat resistance and sound insulating property of a basic material, and to easily add a specific performance (emission of far infrared ray or the like) to the basic material.

Lightweight mortar 3, prepared by adding an admixture of an acrylic polymer or a latex polymer, a hardening accelerating material and a defoaming agent into cement and lightweight aggregate, or a material prepared by mixing ceramic in the lightweight mortar 3 are applied on the surface of various kinds of the basic material 1. If necessary, a net, a reinforcing bar or the like is arranged in the lightweight mortar to reinforce tensile strength and bending strength.