In order to construct welfare space, it is important to research of the human sensory measurement and control in cerebral cortex. In the cerebral function, visual auditory and motion senses are mainly subjects for rehabilitation. For that purpose, it is necessary to consider what kind of stimulus task is given as a stimulus to cerebral cortex. When we constitute space such as "ease" or "healing", it is extremely important that analyze Resonance Phenomenon by the hearing. Therefore we evaluated the nature sound and the artificial sound using the growth (drop, stability, rise) of the low frequency in 1/f　spectrum of sound data. Furthermore, it is calculated the total degree of dimension γ in the nature sound and the artificial sound from the frequency of 1/f fluctuation, and is examined the ratio of nice feeling of the person using task separation which it was classified the nature sound and the artificial sound by dimension γ. In this paper, it is written about the evaluation of 1/f spectrum in the nature sound and the artificial sound, and is described separation of sound data by dimension γ of large, middle, and small.