It is known that there are the following problems in distance education for two or more classes. 1) The reaction of the learner in the remote place is not understood easily. 2) It sometimes confuses the teacher which class he/she should observe. 3) It is difficult to realize an interactive lecture. This paper proposes a response analyzer system using mobile phones in order to solve these problems. The following item exists as an advantage of response analyzer system using mobile phones. 1) Use in the general classroom without equipment is possible. 2) The introduction of the system is cheap. 3) The operation must be easy because the learner is usually using the mobile phone. The system in the server gathers the learners′ responses in distance places and shows the teacher various data-analysis results on line. Therefore, the teacher can grasp the learners′ states on-line, and can make a teaching decision (lecture pace, class which must be seen) optimally.