PURPOSE: To facilitate the operation of the combined measuring apparatus in high speed measuring, by obtaining next optimum combination from the value of the material to be measured which does not correspond to the optimum combination which has been obtained from the previous computation of the combination.

CONSTITUTION: The material to be measured which corresponds to the optimum combination equal or nearly equal to the preset value is delivered from hoppers B1WBn. The new material to be measured is supplied to the vacant hoppers. The next computation of combination is performed before the value of the material to be mesured which is supplied to the hoppers is used for the computation of the combination again. The next optimum combination, which is equal to or nearly equal to the preset value, is obtained from the value of the material to be measured which does not correspond to the optimum combination obtained in the previous computation of the combination. The delivery of the material to be measured from the hoppers are controlled in a time domain by using a conveyer D having E1WE4, and the material to be measured corresponds to the optimum combination is sequentially collected in the buckets E.