This accelerator control device includes: a decision unit which, in processing flow information representing a flow by which a task generated according to a program executed by an accelerator processes data, decides, from among the data, temporary data temporarily generated during execution of a program; a determination unit which, on the basis of an execution status of the task by the accelerator and the processing flow information, determines, for every task using the decided data among the temporary data, whether or not execution of the task has been completed; and a deletion unit which deletes the decided data stored in a memory of the accelerator when execution of every task using the decided data has been completed, whereby, degradation, of processing performance by an accelerator, which occurs when a size of data to be processed by the accelerator is large is avoided.