アイ・オー・データ｜I-O DATA

data japanJapan is a hhly developed market economy and one of the most affluent countries in the world. In 2025, it had the fourth-largest GDP worldwide. With a population of aroundData Portal Service (formerly Open Data Catalog Site) The data portal service is a portal site that enables cross-sectional searches of open data published by administrative organizations. * The service was renewed on