A basic psychology experiment has been conducted to observe psycho-physiological characteristics of on-line human cognitive behavior, where cognitive tasks on memorization and pattern classification were given to subjects by personal computer using simple state transition model. Three types of subjects¡Çs data, eye movement data by eye mark recorder, physio-elctric signals by polygraph and verbal reports, were analyzed with respect to general characteristics of human cognitive behavior from the obtained characteristics of various bio-informatic data such as saccade, eye attention, pupil reaction and blinking, skin potential response and heart rate. It was found that the psycho-physiological measurement utilized was useful to the objective and detailed analysis for the related human cognitive process.