WE CLAIM:
1. A communication apparatus comprising:
a first base station;
a flying object including a second base station; and
a mobile terminal to communicate with the second base station,
wherein
the first base station notifies flying object specification information that is information indicating that the second base station is included in the flying object, and
when the flying object specification information is received, the mobile terminal sets a direction of a beam for detecting the second base station to a second direction that is a direction vertically upward compared to a first direction that is the direction of the beam in a case where the flying object specification information is not received.
2. The communication apparatus according to claim 1, wherein the first base station communicates with the second base station in a cell to which the second base station belongs.
3. The communication apparatus according to claim 1, wherein the first base station belongs to a cell that is different from a cell to which the second base station belongs.
4. The communication apparatus according to any one of claims 1 to 3, wherein the flying object specification information includes information on a moving speed of the

flying object.
5. The communication apparatus according to any one of claims 1 to 4, wherein the flying object specification information includes information on a moving path of the flying object.
6. The communication apparatus according to any one of claims 1 to 5, wherein the flying object specification information includes information on altitude of the flying object.
7. A communication apparatus comprising:
a first base station; and
a flying object corresponding to a mobile terminal that communicates with the first base station,
wherein the mobile terminal sets a direction of a transmission/reception beam for communicating with the first base station to a direction which is shifted by a tilt angle from a direction toward the first base station.
8. The communication apparatus according to claim 7, wherein the tilt angle is set based on a half-value transmission/reception beam width.
9. The communication apparatus according to claim 7 or 8, wherein the tilt angle is set based on altitude of the flying object.
10. The communication apparatus according to any one of claims 7 to 9, wherein

the tilt angle is set smaller when response time of the first base station is longer in communication between the first base station and the mobile terminal.
11. A communication apparatus comprising:
a first base station; and
a flying object corresponding to a mobile station that communicates with the first base station,
wherein, in communication with the first base station, the mobile terminal sets transmission power for the communication larger when the response time of the first base station is longer.
12. The communication apparatus according to any one of claims 7 to 11, further
comprising a second base station belonging to a cell different from a cell to which the
first base station belongs,
wherein
the second base station notifies flying object specification information that is information indicating that the mobile terminal corresponds to the flying object, and
when the flying object specification information is received, the first base station sets a direction of a transmission/reception beam for communicating with the mobile terminal to a second direction vertically upward compared to a first direction that is a direction of the beam in a case where the flying object specification information is not received.
13. A communication apparatus comprising:
a first base station;

a mobile terminal to communicate with the first base station in a cell to which the first base station belongs; and
a second base station belonging to a cell different from the cell to which the first base station belongs,
wherein
at least one of the first base station, the mobile terminal, and the second base station corresponds to a flying object, and
the mobile terminal performs a handover from the first base station to the second base station based on at least a distance from the first base station and a distance from the second base station.
14. A communication apparatus comprising:
a first base station; and
a mobile terminal whose vertical direction is prescribed and to communicate with the first base station,
wherein the mobile terminal sets a direction of a transmission/reception beam for communicating with the first base station to a direction shifted from a direction toward the first base station by a tilt angle.