It has been repeatedly maintained that the selection mechanism is main
ly ''subjective selection'' in the social evolution as against ''natur
al selection'' in the biological evolution. But this claim derives fro
m the misconceptualization of the mechanism of social evolution. Theor
etical entities that are selected are ''individuals'' as physical enti
ties in the biological evolution as against ''subjects'' as ideal enti
ties in the social evolution. Because of the confused identification o
f both entities, the logic of biological reductionism and the above cl
aim are deduced. Based on the proper conceptualization, it is supposed
that on the basis of subjects' worlds (knowledges, beliefs) the natur
al selection is the selection mechanism effects on the rules of subjec
ts and the subjective selection is the selection mechanism effects on
the actions of subjects. Therefore the logic of the explanation for th
e contains of subjects' worlds is indispensable so that the observer c
an discriminate between the natural selection and the subjective selec
tion in the actual process of social evolution.