Tokyo, July 23 (BridgeNews) - The index of activity in Japan's service industry--which accounts for 60% of Japan's economy--rose 0.4% on the month on a seasonally adjusted basis in May, after it showed a revised 2.4% drop in April, the Ministry of Economy, Trade and Industry (METI) has announced. A METI official said activity in the service industry is "in a gradual rising trend."