Memory system and operation method thereof

An operation method of a memory system comprising K memory devices each suitable for storing maximum M commands based on maximum N commands received from a host and performing each set operation in response to the maximum M commands in order of input, the operation method comprises:

• sequentially storing the maximum N commands from the host in a set storage space;
• and
• resetting execution sequences of the maximum N commands stored in the set storage space based on execution information regarding each of the maximum N commands stored in the set storage space and the maximum M commands stored in each of the K memory devices whenever the commands received from the host are stored in the set storage space, and distributing the reset maximum N commands to the K memory devices,
• wherein the execution information comprises a logical address, a physical address, a length, and a use time of a corresponding command.