This paper studies a novel method of an electronic book Webcast service with electromyography. The proposed method has the following three features. First, we can perform the proposed method at a low cost. Second, the method does not heavily load down users. Finally, the method is portable so we can do it in many situations. This paper did experiments with 18 subjects for an actual Electronic Comics Webcast service. The experimental results show that it is effective for assessing degree of fatigue of the service to utilize the method.