Semiconductor memory device storing refresh period information and operating method thereof

Disclosed are a semiconductor memory device which stores refresh period information and an operating method thereof. The semiconductor memory device according to one embodiment of the present invention includes a cell array which includes at least one cell region and a refresh information storage unit which stores first information and second information related to a refresh period by corresponding to each cell region. The cell region is refreshed with the refresh period according to the first information of a first refresh section and the second information of a second refresh section.