Handling method and gateway device of media information security mechanism

The invention relates to a handling method and a gateway device of media information. The method includes that the gateway device receives first media information, the first media information is carried with encryption auxiliary information and one or a plurality of encryption media contents, the encryption auxiliary information comprises an encryption algorithm and/or secret key information, the gateway device is used for converting the first media information to second media information with a different format, the conversion includes extracting and transferring the encryption auxiliary information and various encryption media contents in the first media information, and the gateway device sends the second media information. According to the handling method and the gateway device of media information, the security of local encrypted media can be guaranteed when different businesses are intercommunicated.