A memory system includes a non-volatile memory in which data is stored in a plurality of pages including a first page and a second page and a memory controller. The controller is configured to perform a first write operation on the first page at a first time, perform a second write operation on the second page at a second time after the first time, perform a first read operation on the first page at a time after the first time using a first parameter and store a first index value in association with the first page and the first parameter, and determine a second parameter for a second read operation to be performed on the second page using a time difference between the first time and the second time and the first index value stored in association with the first page.