PROBLEM TO BE SOLVED: To provide a lesson system in which even if any student does not want to answer a question, it is possible to prompt a student to answer the question to thereby make the lesson active.;SOLUTION: A calculation unit (a CPU 101 of a communication lesson server 10) calculates an index indicating past learning activity of a student having a lesson. A storage unit (a storage unit 103 of the communication lesson server 10) stores the index. An extracting unit (the CPU 101) extracts a specific student, based on the index stored in the storage unit 103.;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2018,JPO&INPIT
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