24. The conversational sentence translation apparatus according to claim 2, wherein the selector comprises a correction deciding means for presenting a plurality of conversational sentence examples selected by the semantic searcher prior to the selection of a conversational sentence example to decide through a dialogue with the user whether or not a correction to the conversational sentence entered through the input means is necessary, and for, if deciding that a correction is necessary, transmitting a control signal to the input means and the analyzer; the input means, upon receiving the control signal from the correction deciding means, permits an input of an additional sentence to be added to the last input conversational sentence; and the analyzer comprises a conversational sentence retaining means for retaining an input conversational sentence, so that upon receiving the control signal from the correction deciding means, the analyzer extracts the semantic features from an input conversational sentence generated by adding the additional sentence, entered through the input means, to the input conversational sentence retained in the conversational sentence retaining means.
24. The conversational sentence translation apparatus according to claim 2, wherein the selector comprises a correction deciding means for presenting a plurality of conversational sentence examples selected by the semantic searcher prior to the selection of a conversational sentence example to decide through a dialogue with the user whether or not a correction to the conversational sentence entered through the input means is necessary, and for, if deciding that a correction is necessary, transmitting a control signal to the input means and the analyzer; the input means, upon receiving the control signal from the correction deciding means, permits an input of an additional sentence to be added to the last input conversational sentence; and the analyzer comprises a conversational sentence retaining means for retaining an input conversational sentence, so that upon receiving the control signal from the correction deciding means, the analyzer extracts the semantic features from an input conversational sentence generated by adding the additional sentence, entered through the input means, to the input conversational sentence retained in the conversational sentence retaining means. 25. The conversational sentence translation apparatus according to claim 24, wherein the semantic searcher comprises a counting means for counting the number of conversational sentence examples in which semantic features extracted by the analyzer are contained in the semantic feature strings thereof, based on a result of searching the semantic features; and the correction deciding means presents a count value obtained by the counting means, in addition to the plurality of conversational sentence examples selected by the semantic searcher.