Terminal device, group communication system, and group communication method

A group communication system comprising:

• a plurality of terminal devices installed in movable objects that are different from each other, each including:
• a communication unit configured to transmit and receive information;
• an output unit configured to output information;
• an input unit configured to receive input of state information indicating a state of a movable object;
• and
• a controller configured to;
• determine whether a predetermined state change has occurred in the movable object based on the input state information;
• acquire, as attention information, state-changed position information indicating a state-changed position that is a position of the movable object when the predetermined state change has occurred and attention voice information including an attention content for the state-changed position as voice when it is determined that the predetermined state change has occurred;
• cause the communication unit to transmit the acquired attention information;
• and
• cause the output unit to output the attention information that is transmitted from a server and received by the communication unit;
• and
• the server configured to, when the attention information is received from one terminal device installed in one movable object among the movable objects, identify the one terminal device that is a transmission source of the attention information, adds identification information of the identified transmission source to the attention information, and transmits the attention information to the plurality of the terminal devices.

A group communication method comprising:

• in one terminal device installed in one movable object among terminal devices installed in movable objects that are different from each other,
• determining, when state information indicating a state of the one movable object is input, whether a predetermined state change has occurred in the one movable object based on the input state information;
• acquiring, as attention information, state-changed position information indicating a state-changed position that is a position of the one movable object when the predetermined state change has occurred and attention voice information including an attention content for the state-changes position as voice when it is determined that the predetermined state change has occurred;
• transmitting the acquired attention information;
• outputting the attention information that is received from a server;
• and in the server,
• identifying, when the attention information is received from the one terminal device installed in the one movable object, the one terminal device that is a transmission source of the attention information;
• and
• adding identification information of the identified transmission source to the attention information and transmitting the attention information to the terminal devices.