An operation control method of plural elevators working between many floors is constructed so that a risk floor having a high probability that a long wait occurs is selected from among floors on which a platform call is not generated when a platform call is newly generated, assuming that along with the newly generated platform call a platform call is generated on the risk floor, allocation evaluations are made on the cases of allocating respective elevators to render services to these calls, an elevator to respond to the new platform call is decided based on the allocation evaluation result, and the plural elevators are controlled to be operated based on this decision.