A floating target for naval gunfire. Bit strings {y}1 and {y}2 are obtained respectively from a bit string {y} of information to be compressed. A control unit 11 produces word connection relationships among words included in a word series employed as a candidate for the speech recognition result and stores them into a word connection information storage unit 16. The button connected to the housing covers the opening. The holding ring, on its ring opening, has radially inwardly projecting fastening lugs which extend diagonally with respect to the bottom and are applied to the fastening section. Then a display portion displays the information corresponding to the characters.