In the present study, we classify emotional state into two groups: normal state and stressful state, according to the parameters of registered signals by developed hardware-software complex, based on the linear discriminant analysis (LDA) method. The registered signals are electrocardiography (ECG), electroencephalography (EEG), galvanic skin response (GSR). Method LDA is widely used in biomedical research, and in the problems of diagnosing diseases.