Development of the system for checking attendance of the lecture at the university using the card reader was demonstrated. The rate of checking attendance of the lecture was about 4 to 12 students per minute. The break time of lecture at the Hiroshima Institute of Technology was 10 minute. Therefore, it is possible to check about 40 students' attendance of the lecture for the break time. Also, the probability that check exactly attendance was about 50%. The real time system for checking attendance of the lectures was realized by using preliminary card reader system.