A decision making support device including: an opinion acquiring module that acquires an expressed opinion from each of a plurality of participants with respect to each of the plurality of selective elements; and a target person determining module that determines, with respect to a given selective element, from which participant an opinion on the selective element is to be elicited when there are a plurality of unexpressed participants who have not yet expressed opinions on the selective element, wherein the target person determining module respectively calculates, when assuming that each of the unexpressed participants has expressed any of expected opinions, assumed group satisfaction that is determined based on contents of decision making and contents of expression of opinions of the plurality of participants, and determines from which participant an opinion on the selective element is to be elicited in consideration of the assumed group satisfaction.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A decision making support device supporting decision making including a plurality of selective elements, the decision making support device comprising a processor configured to operate as: an opinion acquiring module that acquires an expressed opinion from each of a plurality of participants with respect to each of the plurality of selective elements; and a target person determining module that determines, with respect to a given selective element, from which participant an opinion on the selective element is to be elicited when there are a plurality of unexpressed participants who have not yet expressed opinions on the selective element, wherein the target person determining module respectively calculates, when assuming that each of the unexpressed participants has expressed any of expected opinions, assumed group satisfaction that is determined based on contents of decision making and contents of expression of opinions of the plurality of participants, and determines from which participant an opinion on the selective element is to be elicited in consideration of the assumed group satisfaction. 2. The decision making support device according to claim 1, wherein the target person determining module obtains, for each of the unexpressed participants, a minimum value of assumed group satisfaction when assuming that any of expected opinions is expressed, and wherein when there is an unexpressed participant for which a minimum value of the assumed group satisfaction becomes larger than any of minimum values of the assumed group satisfaction of other unexpressed participants, the target person determining module determines to elicit an opinion from the unexpressed participant. 3. The decision making support device according to claim 2, wherein the target person determining module obtains, for each of the unexpressed participants, a maximum value of assumed group satisfaction when assuming that any of expected opinions is expressed, and wherein when there is no unexpressed participant for which a minimum value of the assumed group satisfaction becomes larger than any of minimum values of the assumed group satisfaction of other unexpressed participants, the target person determining module determines to elicit an opinion from an unexpressed participant for which the maximum value of the assumed group satisfaction is largest. 4. The decision making support device according to claim 1, wherein the target person determining module obtains, for each of the unexpressed participants, a maximum value of assumed group satisfaction when assuming that any of expected opinions is expressed, and wherein when there is an unexpressed participant for which a maximum value of the assumed group satisfaction becomes larger than any of maximum values of the assumed group satisfaction of other unexpressed participants, the target person determining module determines to elicit an opinion from the unexpressed participant. 5. The decision making support device according to claim 2, wherein the assumed group satisfaction is calculated such that, the larger a sum of opinion adoption scores representing to what degree opinions of the respective participants have been reflected in decision making, the higher the assumed group satisfaction, and the smaller a variation among the opinion adoption scores, the higher the assumed group satisfaction. 6. The decision making support device according to claim 5, wherein the assumed group satisfaction is calculated as a value that is respectively proportional to a sum of the opinion adoption scores and to a reciprocal of a variation among the opinion adoption scores. 7. The decision making support device according to claim 1, wherein the expected opinions with respect to the selective element are, respectively, expressed opinions with respect to the selective element and opinions that differ from the expressed opinions. 8. The decision making support device according to claim 1, wherein the opinion acquiring module includes: an acquiring module that acquires conversational speech by the plurality of participants; a separating module that separates an utterance of each participant from the conversational speech; and a recognizing module that recognizes, from the utterance of each participant, utterance contents using a speech recognition process. 9. A computer-implemented method of supporting decision making including a plurality of selective elements, the method comprising: an opinion acquiring step in which an expressed opinion is acquired from each of a plurality of participants with respect to each of the plurality of selective elements; and a target person determining step in which, with respect to a given selective element, a determination is made regarding from which participant an opinion on the selective element is to be elicited when there are a plurality of unexpressed participants who have not yet expressed opinions on the selective element, wherein in the target person determining step, when assuming that each of the unexpressed participants has expressed any of expected opinions, assumed group satisfaction that is determined based on contents of decision making and contents of expression of opinions of the plurality of participants are respectively calculated, and a determination is made regarding from which participant an opinion on the selective element is to be elicited in consideration of the assumed group satisfaction. 10. A non-transitory computer-readable medium storing a computer program for causing a computer to execute the steps of the method according to claim 9.