1. A terminal for presenting a sentence candidate, comprising: a report data base that stores a plurality of reports, each including a plurality of sentences; a sentence selection unit that receives a selection of a sentence from a user; a report group generation unit that searches the report data base by the selected sentence and generates a report group including a plurality of searched reports as a search result, each of the searched reports including the selected sentence; a sentence group generation unit that extracts a sentence right after the selected sentence from each searched report included in the report group and generates a sentence group from a plurality of sentences which are extracted from the plurality of searched reports, respectively; and a sentence output unit that preferentially outputs a predetermined sentence from the sentence group based on a frequency of using the sentence right after the selected sentence, wherein the sentence output unit outputs not only the predetermined sentence but also a sentence right before and after the predetermined sentence in a report from which the predetermined sentence is extracted, in response to a user's operation.