抄録
We developed Tablet PC based e-learning system, which can learn and study the interesting contents with digital notebook. This system also enables to communicate between teacher and students with web cameras. However, it is difficult to understand the centered state of student for e-learning through a web camera. Therefore, we propose an estimation method for state of observers by using the pattern recognition of their facial expression. The result of this research indicates the relational analysis of the centered state between facial expression and brain wave.