This evaluation device is characterized by comprising: a brain wave acquisition unit for acquiring brain wave signals of multiple subjects acquired from the individual subjects an intensity data generation unit for generating intensity data chronologically representing the relationship between the intensities of signal components in a predetermined frequency band or the intensities of signal components in multiple frequency bands on the basis of the brain wave signals a correlation data generation unit for acquiring all combinations of two paired subjects from the multiple subjects, calculating a cross-correlation function coefficient of the intensity data of each pair at each time instance, and generating correlation data chronologically representing the cross-correlation function coefficient for each pair and an output unit for generating evaluation data representing a value of a synchronous degree of brain wave variations of all the multiple subjects on the basis of the correlation data generated for all the pairs, and outputting the evaluation data.
