PROBLEM TO BE SOLVED: To estimate a weekday/non-weekday on the basis of a movement history of a moving body.SOLUTION: Movement information on a moving body is acquired, then the movement information on the moving body is associated with a date, then is stored as movement history information. Then, one day is divided into plural time zones, vehicle riding frequency for each time zone is determined for each day of the week on the basis of the movement history. The pieces of data of each day of the week are divided into two groups according to similarity, then the days of the week classified to a group having a large number of elements are estimated as a weekday, and the days of the week classified to a group having a small number of elements are estimated as a non-weekday.SELECTED DRAWING: Figure 1
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