When providing a kind of learnt the present invention relates to a kind of educational program, if filter is not suitable for sequentially viewing signal data filter and applies. In order to reach the purpose, the present invention prepares the filter used and is not suitable in filter by collecting various information, unit (110) are generated from filter and use filter appropriate, by collecting various information, from filter cell (130). On the contrary, when filter be it is applicable, filter cell (120) apply filter units (130) situation having the same under as usual work. By the above method, in serial order learning, the present invention improves learning effect by more effectively being learnt. ;The 2014 of copyright KIPO submissions;[Reference numerals] (100) filter system; (110) filter generation unit; (120) filter management unit; (130) filter application unit; (200) textbook; (300) external filter module; (400) user setting; (500) filter is applied in textbook
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