According to one embodiment, a memory system includes a nonvolatile memory, configuration unit, address translation unit, write unit and control unit. The configuration unit assigns write management areas included in a nonvolatile memory to spaces and an input space. The write management area is a unit of an area which manages the number of write. The address translation unit associates a logical address of write data with a physical address which indicates a position of the write data in the nonvolatile memory. The write unit writes the write data to the input space and then writes the write data in the input space to a space corresponding to the write data amongst the spaces. The control unit controls the spaces individually with respect to the nonvolatile memory.