A satellite signal receiving device includes a signal analyzing device and a processor; the signal analyzing device processes a received satellite signal to obtain first information, ands send the first information to the processor; the processor receives a security command and the first information and determines an information processing type for the received first information based on the security command; determines information to process in the first information when it is determined that the information processing type of the first information is the first processing type; sends the information to process and the security command to a security algorithm device, and obtains second information returned after the security algorithm device processed the first information based on the security command; and transmits the second information. Accordingly, when the first information requires security processing, the processor transmits the information after performing a security processing, thereby improving the security of the information.