To calculate a meaningful confidence value by integrating two or more confidence network graphs corresponding to the same object in a confidence network graph in which the confidence values of various related elements in consumption activities in a daily life and inter-element confidence values are defined, and the most satisfactory selection is available by a consumer or the like based on the confidence values.

Multivariate analysis is operated for each stratified confidence network, and the central value of the confidence values after stratification is calculated based on the main components of the confidence value of each node. Also, multivariate analysis is operated for the central confidence value of each node after stratification, and the confidence value after integration is calculated based on the main components of the central confidence value of each node.