Methods and apparatuses for blocking unauthorized data access are provided, one of methods comprises, monitoring whether there is an access to an object by an accessing instance, receiving an user operation event from a user accessibility management module, wherein the user operation event is created by the user accessibility management module and includes information on a user operation object and blocking at least one of the access to the object and a transmission of the object to an external device via a network, in accordance with the access to the object is monitored, when the accessed object is different from the user operation object or no user operation event is provided for the accessed object.