Data Reception Device, Data Transmission Device, and Data Distribution Method

A data transmission device transmitting data by broadcast communication, comprising:

• a data transmission module configured to transmit the data to a plurality of data reception devices including a first data reception device by broadcast communication;
• a reception response information reception module configured to receive reception response information, being transmitted by broadcast communication from the first data reception device to the data transmission device and to data reception devices except the first data reception device from the plurality of data reception devices, and including first data reception device information showing reception data reception devices which have already received the data among the plurality of data reception devices when the first data reception device has received the data;
• a detection module configured to detect data reception devices which have already received the data among the plurality of data reception devices on the basis of first data reception device information included in the reception response information every time the reception response information reception module has received reception response information;
• a second data reception device information update module configured to update second data reception device information indicating data reception devices which have already received the data among the plurality of data reception devices on the basis of information of data reception devices which have already received the data among the plurality of data reception devices detected by the detection module every time the detection module detects the data reception device which has received the data among the plurality of data reception devices;
• and
• a determination module configured to determine whether all the plurality of data reception devices have received data transmitted from the data transmission module on the basis of second data reception device information every time the second data reception device update module has updated the second data reception device information.

A data distribution method, comprising:

• transmitting data to a plurality of data reception devices including a first data reception device and a second data reception device from a data transmission device by broadcast communication;
• receiving, by second data reception device, reception response information, being transmitted from the first data reception device to the distribution server and to data reception devices except the first data reception device from the plurality of data reception devices, and including first data reception device information showing reception data reception devices which have already received the data among the plurality of data reception devices when the first data reception device has received the data;
• detecting, by the second data reception device, data reception devices which have already received the data among the plurality of data reception devices on the basis of first data reception device information;
• transmitting reception response information including first data reception device information showing a data reception device and the second reception device detected by the detection module from the second reception device to the distribution server and to the plurality of data reception devices except the second reception device when the second data reception device has received the data;
• receiving reception response information, by the data transmission device, transmitted from one data reception device among the plurality of data reception devices;
• detecting data reception devices which have already received the data among the plurality of data reception devices on the basis of first data reception device information included in the reception response information every time the data transmission device has received the reception response information;
• updating second data reception device information indicating data reception devices which have already received the data among the plurality of data reception devices detected by the detection module every time the data transmission device has detected the data reception device which has received the data among the plurality of data reception devices;
• and
• determining whether all the data reception devices have received data transmitted from the data transmission module on the basis of second data reception device information every time the data transmission device has updated the second data reception device information.