Communication system and method integrating NFC and SIM

The invention relates to the communication field, especially a communication system and method integrating NFC (Near Field Communication) and SIM. The communication system comprises a base-band processor used for processing and storing incoming signals; and an integrating function module connected to the base-band processor, provided with an NFC controller and an SIM function module, and supporting an NFC mode and/or an SIM mode. The NFC mode and the SIM mode share pins of the integrating function module to realize switching between the NFC mode and the SIM mode. The communication method comprises the steps of: S1, sending a communication request which passes through the base-band processor in the SIM mode and enters the integrating function module; S2, converting the SIM mode into the NFC mode, determining whether a first time of communication with an NFC terminal, executing S3 if yes, and executing step 4 if no; S3, dynamically configuring an inner configuration circuit to couple with the external capacitor in an antenna coupling module, and executing S4; and S4, establishing correct and/or stable communication with the NFC terminal.