It is provided a memory management method for releasing an unnecessary area in a memory area used by a program stored in the memory and executed by the computing device. The memory management method including the step of: setting in the memory, a first memory area which is used to execute the program; setting in the memory, a second memory area which can be operated by the program; setting a utilized area in the second memory area based on an instruction from the program; storing objects including data in the utilized area of the second memory area based on an instruction from the program; determining whether the program uses the objects stored in the utilized area within the second memory area; and releasing, by the computing device, the utilized area occupied by an object that is not used by the program among the objects stored in the utilized area.