When information is memorized, the brain rehearses it. We can preserve information over a long period of time if this rehearsal is effectively performed in studying. This research aims 1.To clarify the effect of the rehearsal in e-learning, 2. To clarify the effective method for summary-making using a prototype system that studies structure of a stock (equity in a company). For this purpose, we 1.Compare the difference among three rehearsal methods, 2. (From result of 1) compare the results of an experiment of "Summarize" rehearsal method. As a result we find that the "Summarize" rehearsal is effective, especially when used for memorization constraints imposed in the number and types words used
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