A data storing system includes a semiconductor device suitable for repeatedly performing a read operation by changing a level of a read voltage according to read voltages listed on a read retry table when a read operation on a selected page is passed, in response to a command and an address, and a controller suitable for controlling the read operation of the semiconductor device by generating the command and the address, wherein a read voltage to be used for performing the read operation is determined among the read voltages listed on the read retry table when the semiconductor device performs the read operation based on data read as a result of a predetermined number of read operations.