A smart chip for data communication, comprising: a processing unit; and a first communication interface connected to the processing unit, configured to receive an Application Protocol Data Unit (APDU) operation command transmitted by a terminal and forward the APDU operation command to the processing unit, and receive a first processing result or a second processing result transmitted by the processing unit and return the first processing result or the second processing to the terminal, characterized in that: the smart chip further comprises at least one second communication interface connected to the processing unit, configured to receive the APDU operation command transmitted by the processing unit and forward the APDU operation command to a smart card connected to the second communication interface, and receive the second processing result returned by the smart card and forward the second processing result to the processing unit; the processing unit is configured to process correspondingly upon determining the APDU operation command is a processing command for the smart chip, and then transmit the first processing result to the first communication interface, otherwise transmit the APDU operation command to the second communication interface, receive the second processing result forwarded by the second communication interface, and transmit the second processing result to the first communication interface; and the processing unit is further configured to initialize, after being powered on, chip hardware, the first communication interface and the second communication interface, receive reset information of the smart card connected to each second communication interface returned by the second communication interface upon determining that the smart chip is connected to the smart card, and transmit all the received reset information to the first communication interface, otherwise transmit the reset information of the smart chip to the first communication interface. a processing unit; and a first communication interface connected to the processing unit, configured to receive an Application Protocol Data Unit (APDU) operation command transmitted by a terminal and forward the APDU operation command to the processing unit, and receive a first processing result or a second processing result transmitted by the processing unit and return the first processing result or the second processing to the terminal, characterized in that: the smart chip further comprises at least one second communication interface connected to the processing unit, configured to receive the APDU operation command transmitted by the processing unit and forward the APDU operation command to a smart card connected to the second communication interface, and receive the second processing result returned by the smart card and forward the second processing result to the processing unit; the processing unit is configured to process correspondingly upon determining the APDU operation command is a processing command for the smart chip, and then transmit the first processing result to the first communication interface, otherwise transmit the APDU operation command to the second communication interface, receive the second processing result forwarded by the second communication interface, and transmit the second processing result to the first communication interface; and the processing unit is further configured to initialize, after being powered on, chip hardware, the first communication interface and the second communication interface, receive reset information of the smart card connected to each second communication interface returned by the second communication interface upon determining that the smart chip is connected to the smart card, and transmit all the received reset information to the first communication interface, otherwise transmit the reset information of the smart chip to the first communication interface. the smart chip further comprises at least one second communication interface connected to the processing unit, configured to receive the APDU operation command transmitted by the processing unit and forward the APDU operation command to a smart card connected to the second communication interface, and receive the second processing result returned by the smart card and forward the second processing result to the processing unit; the processing unit is configured to process correspondingly upon determining the APDU operation command is a processing command for the smart chip, and then transmit the first processing result to the first communication interface, otherwise transmit the APDU operation command to the second communication interface, receive the second processing result forwarded by the second communication interface, and transmit the second processing result to the first communication interface; and the processing unit is further configured to initialize, after being powered on, chip hardware, the first communication interface and the second communication interface, receive reset information of the smart card connected to each second communication interface returned by the second communication interface upon determining that the smart chip is connected to the smart card, and transmit all the received reset information to the first communication interface, otherwise transmit the reset information of the smart chip to the first communication interface.