In the past, comparison of mean values or variances measured from multiple subjects with one another has been a mainstream of diagnostic support to be achieved using cerebral activity signals. However, in this case, it is hard to absorb individual differences, and the precision in a diagnostic support technology is low. In order to improve the precision in the diagnostic support technology, the property of data acquired by an optical organism measurement system is utilized in order to create and display information representing a change in the condition of each person. Thus, diagnosis of each person is effectively supported. Measured light signals are used to calculate and record changes in the concentrations of oxidized hemoglobin (Hb), deoxidized Hb, and total Hb respectively. Based on each data (representing the Hb concentration changes), two or more Hb concentration changes (for example, the oxidized Hb concentration change and deoxidized Hb concentration change) are classified according to whether the changes are increases or decreases, and indicated in the form of symbols , an image, or a graph. Thus, an examining person is provided with compressed and simplified information and supported in diagnosis.
