This article describes the term extraction method the authors proposed to extract terms consisting of simple and compound nouns and the experimental evaluation of the proposed method with the NTCIR TMREC test collection. The basic idea of scoring a simple noun N of the term extraction method is to count how many nouns are conjoined with N to make compound nouns. Then this score was extended to measure the score of compound nouns because most of technical terms are compound nouns. This method has a parameter to tune the degree of preference either for longer compound nouns or for shorter compound nouns.