1. A method of analysis of lipoprotein particles comprising the steps of: separating a plurality of classes of lipoproteins contained in a subject sample by liquid chromatography and then detecting signals derived from components included in the separated lipoprotein particles; and assuming that each of the lipoprotein particles is constituted of subclasses estimated from component peaks consisting of anchor peaks and extra essential peaks and then calculating an approximated curve corresponding to summation of the component peaks using said detected signals.