A cache method and a cache system for storing file's data in memory blocks divided from a cache memory are disclosed. The cache method for storing data of a file in memory blocks divided from a cache memory includes: receiving a request command for first data of a first file from an application; retrieving a memory block that stores the first data; setting reference information which indicates that the memory block storing the first data is referred to by the application; transmitting the first data stored in the memory block to the application; and resetting the reference information for the memory block that stores the first data.