Provided is a discussion system and method for Internet-based reasonable decision-making tool, capable of inducing healthy discussion prosecution by a systematic and standardized discussion procedure and rule to solve various points at issue or conflicts and decision-making generated in a society, an enterprise and group; and of establishing theory and knowledge by creating a model that can extract all information, knowledge, suggestion and proposition of a group needed for decision-making through interactive discussion ping-pong by structural objectification for each case and inducing a conclusion. The system is capable of selectively specifying and operating a different discussion prosecuting procedure for each nature and type of the discussion using a pre-classified and registered discussion rule; defining a role of all discussion participants such as a moderator, a panel, a stakeholder, and an audience; and producing and managing discussion information in a hierarchical structure of discussion classification information, subtopic information, suggestions, suggestion grounds, and counter arguments. The system comprises a special statement editor capable of breaking down an argument for each detailed point at issue and structurally registering it. The system has a function of performing interactive ping-pong on various arguments and arguments for each point at issue, structurally enquiring a ping-pong situation, analyzing all suggested arguments and counter arguments to define a logical structure, correlation and nature between arguments, kicking out logically unsuitable arguments and defective arguments based on the logical structure, correlation and nature, defining an evaluation rule that can define logical reasonableness of the argument based on a nature definition and ping-pong resu and performing systematic, automatic evaluation for each detailed case on suitability of the suggestion.
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