1. A process analysis method for estimating the similarity between at least not less than two clinical processes, comprising the steps of: forming a plurality of matrixes in which, out of the time information of rendered clinical service, the type of clinical service, and the quantity of clinical service in a clinical process, the type of clinical service and the time of clinical service are set to be the row and the column, respectively, and the quantity is set to be a matrix element; arranging each matrix element of the plurality of the matrixes on a multidimensional space in which the row number and the column number M(i, j) of each of the formed matrixes are used as the axes to form a process metric space; calculating the similarity between processes defined by the metric between the respective matrix elements in the process metric space; and estimating the similarity between at least not less than two clinical processes by using the similarity between processes.