1. A search apparatus comprising: a speech recognition unit that recognizes an input voice; a matching unit that matches a plurality of strings of search result target words, which are strings of words that are the targets of search result of a string of words corresponding to the input voice, with a speech recognition result, using a string of search result target words, which is a line of pronunciation symbols representing pronunciations of the strings of search result target words, and a string of recognition result pronunciation symbols that are a line of pronunciation symbols representing the pronunciation of the speech recognition result of the input voice; a generation unit that generates a string of search result words, which is a search result of a string of words corresponding to the input voice from the plurality of strings of search result target words on the basis of the result of matching the string of search result target words with the speech recognition result; a selecting unit that selects emphasis target words that are the targets to be emphasized in the words of the string of search result words, on the basis of the matching result with the string of search result target words, which is the string of search result words, and a pronunciation symbol-to-word table in which the pronunciation symbols and the words are made to correspond to each other; and a conversion unit that converts the string of search result words into the string of emphasis words in which the emphasis target words are emphasized in the words of the string of search result words.