Electronic apparatus and controlling method thereof

An electronic apparatus includes a memory storing a plurality of pieces of data by a distributed data storing method; a communication interface configured to be communicatively connected to an external apparatus; and a processor configured to: based on identifying that first data corresponding to the external apparatus among the plurality of pieces of data stored in the memory has been changed to second data, change a state of the second data to a locked state; and control the communication interface to transmit the second data in the locked state to the external apparatus by a streaming method, wherein in the locked state the second data cannot be changed in response to a data change command.