An exercise material for electrocardiogram (ECG) analysis has been developed on the Web. Clinically obtained ECGs were presented on the Web page and trainees were asked questions in the style of multiple choice test to choose the most-likely diagnosis, with an attribute of radio button. By submitting answers, the student would receive his/her score with correct answers and explanations. Responses from students were generally favorable. Although the students felt it difficult to analyze real ECGs, they have realized that they need more practice. These facts suggest that Web presentation in such style will be a useful material for practice in analyses of graphic or image data obtained in such as physiological or microscopic examinations.