[Problem] At least one of the following three issues: personalization of discussions, difficulties in maintaining a sound discussion system, and difficulty in evaluating proposals that occur when conducting proposal-based discussions online. The difficulty and improvement. A proposal evaluation device (5) that communicates with each of client terminals (1A and 1B) via a communication network (3) and authenticates each user is provided with a proposal support unit (500) and an evaluation support unit (520). The proposal support means 500 prompts the authenticated user to submit a well-formed proposal including, as components, each of the beliefs or facts, the measures, and the association between the beliefs or facts and the measures. The evaluation support means 520 urges the authenticated user to vote for the evaluation of the submitted well-formed proposal for each component. [Selection diagram] Fig. 1
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