The problem database the answer database the making questions section having with the level decisive section 22 which, decides the level of the user from the result of being graded in the grade section 20 which grades the reply of 19 which extracts the optional problem where is transmitted to the terminal 11 of 18 where the answer of each problem of 17 where many problem is remembered and problem database 17 is remembered and the user from problem database 17 and the user and particular grade section 20 study level decision device 14 is formed. Making questions section 19 the plural times makes questions the block which consists of the problem group of same level, level of the problem group of block after 2nd is decided according to the grade result for the reply of each problem of previous block, level decisive section 22, synthesizing the grade result of problem of each block, decides the aforementioned level.
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