When a phrase is input via an input unit (41), a phrase case retrieving unit (21) retrieves cases including the phrase based on a case file (51), a scoring unit (22) scores the cases up to a maximum score of 40 according to phase-included matching levels, and a rearranging unit (23) rearranges the scored cases in a descending score order for displaying on a monitor (42) along with an associated question. When answering to a question displayed from a different view point, a re-scoring unit (25) recalculates and increases or decreases scores according to the answer result. If a maximum score of a certain value of 80 is reached by the re-scoring, an evaluation judging unit (26) recommends a case with the maximum score.
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