The disclosure provides a data storage method, a memory storage apparatus, and a memory control circuit unit. The method includes: allocating logical addresses to be mapped to physical programming units of physical erasing units; grouping the logical addresses into logical address groups; receiving write commands and data to be stored into the logical addresses; writing the data into the physical programming units; recording a data write timestamp of each of the physical erasing units; recording a bit sum of each of the logical address groups; and identifying the data belonging to the first logical address group as cold data if the bit sum of a first logical address group is less than a bit sum threshold value and the data write timestamp of the physical erasing units writing data belonging to the first logical address group is less than a timestamp threshold value.