A radiotherapy device control apparatus instructs a radiotherapy device to execute instruction information based on a treatment regimen determined in advance, controls the operations of an irradiation-related instrument provided in the radiotherapy device on the basis of irradiation conditions included in the instruction information, determines whether irradiation is permitted on the basis of results detected by an irradiation target detection unit that detects movement of a target to be irradiated, controls execution and interruption of therapeutic irradiation on the basis of the determined result, stores the history of interruption of irradiation according to the determination by the irradiation permission determination unit, and causes the instrument to run the operations based on the instruction information to completion, regardless of whether irradiation has been interrupted during execution of the instruction information.
