A system and method can support using a data source to connect an application server with a clustered database. The invention relates to a method for producing fibrocytes comprising contacting a population of human peripheral blood mononuclear cells comprising predominantly CD14 cells with autologous T cells or a form of TGF, preferably TGF1, thereby inducing differentiation of fibrocytes from precursors in the PBMC population. The frequency data generating unit generates, based on the first learning data, frequency data indicating appearance frequencies of both wordings and readings of phrases.