  This study presents a generalization for a method examining the correlation
function of an arbitrary system with interactions in an Ising model to obtain a
value of correlation between two arbitrary points on a network. The
establishment of a network clarifies the type of calculations necessary for the
correlation values between secondary and tertiary nodes. Moreover, it is
possible to calculate the correlation values of the target that are interlinked
in a complex manner by proposing a network analysis method to express the same
as a network with mutual linkages between the target of each field.
