Communication apparatus, system, method, and recording medium of program

A communication system comprising:

• A first communication apparatus that transmits data to a second communication apparatus in a group of communication apparatuses;
• and
• an information processing device not included in the group of communication apparatuses, wherein
• the information processing device includes a calculating device to calculate a number of hops on a communication route from the first communication apparatus to the second communication apparatus based on information that represents a connection relationship between communication apparatuses in the group of communication apparatuses, stored in an information storage device;
• and
• the communication apparatus includes an acquiring device to acquire the number of hops on the communication route from the first communication apparatus to the second communication apparatus,
• a selecting device to select a first communication protocol having a shorter transfer time than a second communication protocol among at least two protocols based on the number of hops acquired by the acquiring device, and
• a controlling device to control transmission of the data using the first communication protocol.

A communication apparatus comprising:

• a memory;
• a processor;
• and
• a communication interface, wherein
• the memory stores a number of hops on a communication route from a first communication apparatus to a second communication apparatus;
• the processor selects from at least two communication protocols a first communication protocol having a shorter transfer time than a second communication protocol, where the transfer time is predicted based on the number of hops on the communication route from the first communication apparatus to the second communication apparatus and a data size of the data, and controls transmission of the data using the first communication protocol;
• and
• the communication interface transmits the data to the second communication apparatus based on the control of the processor.

A communication system comprising:

• a group of communication apparatuses and an information processing device, wherein
• the information processing device includes a first processor and a first communication interface, where
• the first processor calculates a number of hops on a communication route between communication apparatuses included in the group of communication apparatuses based on a connection relationship between communication apparatuses included in the group of communication apparatuses, and performs control of transmitting the calculated number of hops to the group of communication apparatuses on the first communication interface;
• and
• the communication apparatus included in the group of communication apparatuses includes a second processor and a second communication interface, where
• the second processor selects from two or more communication protocols, a first communication protocol having a shorter transfer time than a second communication protocol, where the transfer time is predicted based on the number of hops on the communication route from a first communication apparatus to a second communication apparatus included in the group of communication apparatus, received from the information processing device, and a data size of the data, and
• uses the first communication protocol to control transmission of the data to the second communication apparatus on the second communication interface.