To easily estimate the winning horses by summarizing such items as racecourse indexes, dates, horse names, classes of winning horses of all horse races which are held in the racecourses of a country.

A data table contains such items as the racecourse indexes, dates, horse names, winning horse names, winning horse class names, turf horsecourses, dirt horsecourses, distance-based standard times, distances, times and time indexes of all horse races which are held in the racecourses in a country. Then the present horse racing includes all factors and only the clocks are listed in a chart book for easier application of them. Thus a user can easily decide the capability and the real power of every horse by looking at the displayed data. As a result, everyone can enjoy more easily the horse racing in a lower degree of its understanding and with no extra labor required. Thus even a beginner changes his attitude against the horse racing and can pleasantly estimate the winning horses.