When receiving Dual Tone Multi-Frequency (DTMF) information, we provide a way to determine whether to store such, which may include sensitive user input information. More specifically, a media gateway (MG) obtains DTMF digit mask control information, which indicates whether DTMF digit information may include sensitive user input information not suitable for storage. Based thereon, it decides, whether to store the received DTMF digit information. In this way, the DTMF digit mask control information controls whether to store the user input information on the DTMF digit information processing device in the architecture with the service function being separated from the bearing function; thus, avoiding information security risks brought by indiscriminate storage of sensitive contents in the user input information.