Abstract: A data complementing system stores cell-region characteristic data that includes values of a plurality of data items regarding a cell region that is a region obtained by dividing the region into a mesh, information indicating a missing data item that is the data item of missing data being data missed in the cell-region characteristic data, external region characteristic data that includes values of a plurality of data items regarding an external region that is different from the region, and an external cell-region characteristic data that includes values of a plurality of data items regarding an external cell region obtained by dividing the external region into a mesh, generates a complement model for generating complement data indicating a value of the missing data item based on the external region characteristic data and the external cell-region characteristic data, and generates the complement data based on the complement model.

Abstract: A data reliability calculation device holds a data user score for each data user, a data provider score for each data provider, and data reliability for each data, and when calculating the data reliability of certain data, the data reliability of the data is calculated on the basis of the data user score of the data user using the data, the data provider score using the data, and the data reliability of the original data. When calculating the data reliability of certain data, a value obtained by adding the sum of the data user scores of the data users using the data, the data provider scores of the data providers of the data, and the arithmetic average of the reliability of the original data is calculated as the data reliability of the data. Accordingly, it is possible to present a quantitative index of how reliable the data is.

Abstract: A data complementing system stores cell-region characteristic data that includes values of a plurality of data items regarding a cell region that is a region obtained by dividing the region into a mesh, information indicating a missing data item that is the data item of missing data being data missed in the cell-region characteristic data, external region characteristic data that includes values of a plurality of data items regarding an external region that is different from the region, and an external cell-region characteristic data that includes values of a plurality of data items regarding an external cell region obtained by dividing the external region into a mesh, generates a complement model for generating complement data indicating a value of the missing data item based on the external region characteristic data and the external cell-region characteristic data, and generates the complement data based on the complement model.