A method applied in a communications terminal having a connection established with a server, comprising: receiving a management and control instruction provided by the server; parsing, according to a predetermined data exchange format, the received management and control instruction to obtain operation information, wherein the operation information comprises command information and additional information; generating a corresponding working instruction according to the command information and the additional information that are obtained through parsing; and executing, according to the working instruction, work for protecting data security; wherein the command information is SMS message forwarding command information, the additional information is a mobile phone number of a receiver of a forwarded SMS message, and a corresponding SMS message forwarding instruction is generated according to the command information and the additional information that are obtained through parsing; and the step of executing, according to the working instruction, work for protecting data security comprises: determining a type of the working instruction; when it is determined that the working instruction is a SMS message forwarding instruction, determining a state of a SIM card; when it is determined that the state of the SIM card is a ready state, monitoring a new incoming SMS message; and sending the new incoming SMS message to a communication device corresponding to the mobile phone number of the receiver of the forwarded SMS message. receiving a management and control instruction provided by the server; parsing, according to a predetermined data exchange format, the received management and control instruction to obtain operation information, wherein the operation information comprises command information and additional information; generating a corresponding working instruction according to the command information and the additional information that are obtained through parsing; and executing, according to the working instruction, work for protecting data security; wherein the command information is SMS message forwarding command information, the additional information is a mobile phone number of a receiver of a forwarded SMS message, and a corresponding SMS message forwarding instruction is generated according to the command information and the additional information that are obtained through parsing; and the step of executing, according to the working instruction, work for protecting data security comprises: determining a type of the working instruction; when it is determined that the working instruction is a SMS message forwarding instruction, determining a state of a SIM card; when it is determined that the state of the SIM card is a ready state, monitoring a new incoming SMS message; and sending the new incoming SMS message to a communication device corresponding to the mobile phone number of the receiver of the forwarded SMS message. determining a type of the working instruction; when it is determined that the working instruction is a SMS message forwarding instruction, determining a state of a SIM card; when it is determined that the state of the SIM card is a ready state, monitoring a new incoming SMS message; and sending the new incoming SMS message to a communication device corresponding to the mobile phone number of the receiver of the forwarded SMS message.