The purpose of the present invention is to enable mixture data in which different influencing factors are mixed to be stratified depending on influencing factor in failure analysis. A range setting unit 11 divides an area to be analyzed into meshes, and divides the area to be analyzed into a group A and a group B in the smallest unit of the mesh. An analysis unit 12 uses inspection data on facilities X present in the meshes in the group A to perform Weibull distribution by a cumulative hazard method. A determination unit 13 uses the degree of deviation of the plots based on the Weibull distribution from a regression line as an index to determine whether the group A is a mixed area or a single area. A range enlargement unit 14 repeats processing for shifting meshes from the group B to the group A while keeping the group A to be a single area.
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