Memory management system and method for managing memory

A memory management system comprising:

• a first virtual machine;
• a second virtual machine;
• and
• a hypervisor configured to:
• manage a region to which the first virtual machine and the second virtual machine access in a memory,
• control the first virtual machine to access a first region and a shared region in the memory and not to access a second region different from the first region in the memory,
• control the second virtual machine to access the shared region and the second region in the memory and not to access the first region in the memory, and
• in response to a request of the first virtual machine, store an in-memory data isolation (IMDI) table that indicates an IMDI region that a task of the first virtual machine accesses and a task of the second virtual machine does not access, in the memory.