Data communication system, data communication method, and non-transitory storage medium

A data communication method that performs, in a data communication system that includes a plurality of mobile communication bodies, data communication between the plurality of mobile communication bodies, the data communication method comprising:

• acquiring, with each of the mobile communication bodies, positional information of a third party, positional information of each of the communication bodies, and terrain information, the third party being capable of detecting the data communication performed between the plurality of communication bodies, the terrain information being information on terrain on periphery of a current location of the plurality of mobile communication bodies;
• selecting, when a transmission of transmission data from a first one of the communication bodies to a second one of the communication bodies is not successful and a transmission of the transmission data from the first one of the mobile communication bodies to third and fourth ones of the mobile communication bodies is successful, by the third and fourth ones of the mobile communication bodies, the fourth one of the communication bodies by determining that the fourth one of the mobile communication bodies has a lowest possibility, between the third and fourth ones of the mobile communication bodies, that the data communication is detected by the third party, on a basis of the positional information of each of the third and fourth ones of the communication bodies, the terrain information, and the positional information of the third party;
• and
• transmitting, from the fourth communication body upon the selection, the transmission data to the second communication body.

A non-transitory computer readable storage medium having a data communication program, the data communication program causing, when executed by a computer, the computer to implement a method that performs, in a data communication system that includes a plurality of mobile communication bodies, data communication between the plurality of mobile communication bodies, the method comprising:

• acquiring, with each of the mobile communication bodies, positional information of a third party, positional information of each of the communication bodies, and terrain information, the third party being capable of detecting the data communication performed between the plurality of communication bodies, the terrain information being information on terrain on periphery of a current location of the plurality of mobile communication bodies;
• selecting, when a transmission of transmission data from a first one of the communication bodies to a second one of the communication bodies is not successful and a transmission of the transmission data from the first one of the mobile communication bodies to third and fourth ones of the mobile communication bodies is successful, by the third and fourth ones of the mobile communication bodies, the fourth one of the communication bodies by determining that the fourth one of the mobile communication bodies has a lowest possibility, between the third and fourth ones of the mobile communication bodies, that the data communication is detected by the third party, on a basis of the positional information of each of the third and fourth ones of the communication bodies, the terrain information, and the positional information of the third party;
• and
• transmitting, from the fourth communication body upon the selection, the transmission data to the second communication body.

A data communication system that includes a plurality of mobile communication bodies, the plurality of mobile communication bodies each comprising circuitry configured to:

• perform data communication between the plurality of mobile communication bodies,
• acquire positional information of a third party, positional information of each of the mobile communication bodies, and terrain information, the third party being capable of detecting the data communication performed between the plurality of mobile communication bodies, the terrain information being information on terrain on a periphery of a current location of the plurality of mobile communication bodies, and
• when a transmission of transmission data from a first one of the mobile communication bodies to a second one of the mobile communication bodies is not successful and a transmission of the transmission data from the first one of the mobile communication bodies to third and fourth ones of the mobile communication bodies is successful, select, with the third and fourth ones of the mobile communication bodies, the fourth one of the mobile communication bodies based on a determination that the fourth one of the mobile communication bodies is lowest among the third and fourth ones of the mobile communication bodies in a possibility that the data communication is detected by the third party, on a basis of the positional information of each of the third and fourth ones of the mobile communication bodies, the terrain information, and the positional information of the third party, and
• wherein, upon selection, the fourth one of the mobile communication bodies is configured to transmit the transmission data to the second one of the mobile communication bodies.