1. An apparatus for selecting a motion expressing artificial feelings, the apparatus comprising: a feeling expression setting unit configured to set a probability of each of feeling expression behaviors performed by each of expression elements of a machine with respect to each of predetermined feelings; a behavior combination generation unit configured to generate at least one behavior combination comprising at least one of the feeling expression behaviors randomly extracted from each of the expression elements one at a time, wherein the probability of each of the feeling expression behaviors includes at least one of probabilities of at least one of the predetermined feelings; and a behavior combination selection unit configured to: calculate each of averages of the probability of the feeling expression behaviors included in the at least one behavior combination according to each of the predetermined feelings of the machine; and select one of the at least one behavior combination having an approximate average, wherein the approximate average is any of the averages of the probability of each of the feeling expression behaviors according to each of the predetermined feelings closest to a predetermined feeling value of the machine.