To solve, while a problem on the dispersion of a compounding substance is always present in compounding the substance in a polymer, particularly, the problem that a nanocarbon, a new compounding substance, such as a carbon nanotube, a carbon nanocoil/microcoil or a fullerene has no order of kneading and compounding established, thus having poor dispersibility, and provides inadequate molding, molded body and product characteristics.

The method for solving the problem involves, when kneading and compounding the nanocarbon such as the carbon nanotube, carbon nanocoil/microcoil and the fullerene with a single substance such as a rubber polymer, a thermoplastic elastomer or a resin, or with a blend polymer of among a rubber polymer, a thermoplastic elastomer, a resin and the like, kneading and compounding a reinforcement and/or a filler other than the nanocarbon, and then kneading and compounding the nanocarbon.