A memory system of the present invention includes a memory device having a nonvolatile memory and an access device which accesses the memory device. The memory device has a detection unit to detect a temperature of the memory device, a determination unit to determine an operating condition in accordance with the detected temperature and a notification unit to notify the access device of the determined operating condition. The access device has an interface unit to connect to the memory device and a controlling unit to control the interface unit in accordance with the notified operating condition from the memory device.