1. A search apparatus, comprising: a speech recognition unit that recognizes an input voice; a matching unit that matches symbol units from one or more lines of pronunciation symbols derived from a string of search result target words with symbol units from one or more lines of pronunciation symbols derived from a speech recognition result of an input voice, wherein each line of pronunciation symbols of the string of search result target words is a line of syllables extracted from the string of search result target words and each string of pronunciation symbols of the speech recognition result is a line of syllables extracted from the speech recognition result of the input voice upon the result of matching the symbol units from such lines of pronunciation symbols of the string of search result target words with the symbol units from such lines of pronunciation symbols of the speech recognition result producing a highest degree of similarity, and each line of pronunciation symbols of the string of search result target words is a line of two-syllable concatenations formed by pairing adjacent ones of the syllables extracted from the string of search result target words, such that each syllable extracted from the string of search result target words is paired with its immediately preceding extracted syllable in a particular one of the line of two-syllable concatenations and is paired with its immediately succeeding extracted syllable in a next one of the line of two-syllable concatenations, and each string of pronunciation symbols of the speech recognition result is a line of two-syllable concatenations formed by pairing adjacent ones of the syllables extracted from the speech recognition result of the input voice, such that each syllable extracted from the speech recognition result is paired with its immediately preceding extracted syllable in a given one of the further line of two-syllable concatenations and is paired with its immediately succeeding extracted syllable in a next one of the further line of two-syllable concatenations, upon the result of matching the symbol units from such lines of pronunciation symbols of the string of search result target words with the symbol units from such lines of pronunciation symbols of the speech recognition result producing the highest degree of similarity; a generation unit that generates a string of search result words based on the result of matching the symbol units from the one or more lines of pronunciation symbols of the string of search result target words with the symbol units from the one or more lines of pronunciation symbols of the speech recognition result; a selecting unit that selects words to be emphasized in the string of search result words based on a matching result of one or more lines of pronunciation symbols of the string of search result words and a pronunciation symbol-to-word table in which the pronunciation symbols correspond to the emphasis target words; and a conversion unit that converts the string of search result words into a string of emphasis words in which the emphasis target words are emphasized in the string of search result words.