This study investigated the characteristics of the songs of crickets and considered how the songs affect the human mind from the points of acoustics, physiology and psychology. The songs of five cricket species, Homoeogryllus japonicus (HoJ), Teleogryllus emma (TE), Oecanthus indicus (OI), Tettigonia yama (TY) and Hexacentrus japonicus (HeJ), were used for this study, and the acoustical characteristics, mode of 1/f fluctuation, electroencephalogram and the psychological questionnaire on the songs were carried out. In the song of HoJ, the fundamental pitch was seen at 5 kHz; TE and OI were at 3 kHz; TY was 9 kHz; and HeJ was at 12 kHz. When the fluctuation patterns of the songs were analyzed with Fast Fourier Transformation, a 1/f mode was often seen at a low frequency regions of power-spectrum. The alpha wave was often observed with electroencephalograph when the subjects listened the sounds. From the results of questionnaire with SD method, it was revealed that HoJ and TE seemed to be preferred by subjects, rather than OI, TY and HeJ. The factor analysis showed the feature of each song as follows; HoJ and TE, comfortable sound; OI, non-rhysimical sound; TY and HeJ, loud sound. These results suggest that the songs are pleasant for human mind.