Control apparatus, movable object, control method, and terminal

A control method comprising:

• specifying a risk area outside a movable object where a risk is involved with respect to a movement of the movable object;
• performing, when the risk area is specified, control to transmit alert information related to a position of the risk area to an outside of the movable object without designating a destination;
• performing control to receive response information transmitted by an other movable object in response to the alert information, the response information including information related to a position of the other movable object;
• and
• executing control of the movable object based on position information of the risk area and the information related to the position of the other movable object which is acquired through the response information, wherein
• the alert information includes information for controlling a mode related to a transmission cycle of the response information to be transmitted by the other movable object which has received the alert information.

A terminal comprising:

• at least one processor;
• a reception control unit configured to perform, using the at least one processor, control to receive alert information related to a position of a risk area where a risk is involved with respect to a movement of an external movable object, the alert information being transmitted by the external movable object;
• and
• a transmission control unit configured to perform, using the at least one processor, control to transmit, to the external movable object, response information including information related to a position of the terminal in response to receiving the alert information, wherein
• the alert information includes information for controlling a mode related to a transmission cycle at which the terminal transmits the response information, and
• the transmission control unit is configured to switch, using the at least one processor, the mode related to the transmission cycle based on the information included in the alert information when the position of the terminal is in the risk area or within a predetermined range from the position of the risk area.