A RFID communication unit (10, 210, 310), comprising: a higher-order communication control part for performing communication with a higher-order controller in a predetermined communication period, wherein the higher-order controller is external to the RFID communication unit(10, 210, 310), the higher-order controller is configured to communicate with the RFID communication unit(10, 210, 310) by exchanging a plurality of data, each data having the same fixed data exchange size, and each data being communicated during a fixed communication period; and a RF communication control part (20, 220, 320) for performing at least one of reading and writing of data with a RF tag by wireless communication; the RFID communication unit (10, 210, 310) being characterized in that the RF communication control part (20, 220, 320) is configured to select: a division transfer method for dividing data subjected to at least one of reading and writing with the RF tag into a plurality of data packets, each data packet having the same data exchange size and each data package being communicable in one communication period in the higher-order communication control part, and transferring each of the plurality of data packets to the higher-order controller or to the RF tag in the one communication period, wherein the RF communication control part (20, 220, 320) is configured to concurrently execute the wireless communication with the RF tag during the communication period in which communication by the higher-order communication control part is performed; or a batch transfer method for collectively transferring data subjected to at least one of reading and writing with the RF tag, wherein the data is transferred to the RF tag in one single communication period, and wherein the data is then transferred to, or was transferred beforehand from, the higher-order controller in another communication session. a higher-order communication control part for performing communication with a higher-order controller in a predetermined communication period, wherein the higher-order controller is external to the RFID communication unit(10, 210, 310), the higher-order controller is configured to communicate with the RFID communication unit(10, 210, 310) by exchanging a plurality of data, each data having the same fixed data exchange size, and each data being communicated during a fixed communication period; and a RF communication control part (20, 220, 320) for performing at least one of reading and writing of data with a RF tag by wireless communication; the RFID communication unit (10, 210, 310) being characterized in that the RF communication control part (20, 220, 320) is configured to select: a division transfer method for dividing data subjected to at least one of reading and writing with the RF tag into a plurality of data packets, each data packet having the same data exchange size and each data package being communicable in one communication period in the higher-order communication control part, and transferring each of the plurality of data packets to the higher-order controller or to the RF tag in the one communication period, wherein the RF communication control part (20, 220, 320) is configured to concurrently execute the wireless communication with the RF tag during the communication period in which communication by the higher-order communication control part is performed; or a batch transfer method for collectively transferring data subjected to at least one of reading and writing with the RF tag, wherein the data is transferred to the RF tag in one single communication period, and wherein the data is then transferred to, or was transferred beforehand from, the higher-order controller in another communication session. a division transfer method for dividing data subjected to at least one of reading and writing with the RF tag into a plurality of data packets, each data packet having the same data exchange size and each data package being communicable in one communication period in the higher-order communication control part, and transferring each of the plurality of data packets to the higher-order controller or to the RF tag in the one communication period, wherein the RF communication control part (20, 220, 320) is configured to concurrently execute the wireless communication with the RF tag during the communication period in which communication by the higher-order communication control part is performed; or a batch transfer method for collectively transferring data subjected to at least one of reading and writing with the RF tag, wherein the data is transferred to the RF tag in one single communication period, and wherein the data is then transferred to, or was transferred beforehand from, the higher-order controller in another communication session.