Provided are a device and a method of controlling network data induced by a malicious code of a mobile apparatus. Information input by a user through an input unit of a mobile apparatus is analyzed to determine whether or not the network data generated in the mobile apparatus are network data which are generated in accordance with user's intention, the network data generated in accordance with user's intention are transmitted to an external communication network, the network data which are generated irrespective of user's intention is consider to be network data which causes extrusion of personal information of the user which is induced by the malicious code residing in the mobile apparatus or an external attacker or network data which attack the external communication network, so that transmission of the network data to the external communication network is blocked.