A lecture support system is configured to comprise: a monitor apparatus that monitors speech and behavior of a teacher during a lecture and extracts trigger information among his speeches and behaviors during the lecture; an image analysis apparatus that obtains a first shot image of a student during lecture and estimates a visual direction of the student based on the first shot image; and a judgment apparatus that judges the degree of concentration of the student based on the visual direction and a preferred visual direction according to the trigger information extracted by the monitor apparatus.
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