An assignment management apparatus includes: a traffic acquisition unit that acquires traffic per unit time; a storage unit that stores traffic per unit time when an operator is assigned, as traffic upon assignment, in association with the operator and an assignment sequence, and stores traffic per unit time when the assignment is canceled, as traffic upon cancellation; a processing capacity calculation unit that calculates difference between the traffic upon assignment of the operator and traffic upon assignment of an operator whose assignment sequence is next to the operator, as processable traffic of operators; and a determination unit that determines that it is timing to cancel assignment of an operator, in a case in which the traffic per unit time is decreased by the processable traffic calculated for the operator from the traffic upon cancellation.