E-learning systems that use computers and the Internet have become popular around us. Utilization of e-learning systems at schools for classwork has been widely used. However, there are some students that don’t concentrate on study. The objective of this study is to construct an e-learning system that stimulates students to concentrate on learning. The e- learning system captures images of students with web cameras and warns a student with a message and sound when the system finds out that the student is not concentrating. Through experiments, the accuracy of detection and the effect of warning are evaluated.