Radiotherapy device control apparatus and control method

A radiotherapy device control apparatus comprising:

• a therapy plan execution unit that instructs execution of instruction information based on a therapy plan which is defined in advance;
• an irradiation operation controller that controls an operation of a device related to irradiation provided on a radiotherapy device, based on an irradiation condition included in the instruction information;
• an irradiation possibility judging unit that judges whether or not irradiation is possible based on a detection result of an irradiation target detector that detects a motion of an irradiation target;
• an irradiation controller that controls execution and interruption of irradiation of a therapeutic radiation based on a result of the judgment;
• and
• an irradiation recorder that records an interruption history of irradiation by the judgment of the irradiation possibility judging unit, wherein
• the irradiation operation controller executes the operation of the device based on the instruction information to the last operation regardless of presence or absence of an interruption of the irradiation during execution of the instruction information.