1. A communication system, comprising: an access apparatus(es) accessed by communication t e r m i n a l s ; a packet forwarding apparatus(es) forwarding packets via the access apparatus(es); a f i r s t management a p p a r a t u s c o n t r o l l i n g operation modes relating to energy consumption of the access apparatus(es); and a second management a p p a r a t u s c o n t r o l l i n g operation modes relating to energy consumption of t h e packet forwarding apparatus(es) based on a change of the operation modes r e l a t i n g t o the energy consumption of t h e access apparatus(es).

2. The communication system according t o c l a i m 1, wherein t h e f i r s t management apparatus comprises: means for determining whether t o change t h e operation modes relating to the energy consumption of the access apparatus(es) based o n a s t a t e o f t h e access apparatus(es); means for changing t h e operation modes relating to the energy consumption of t h e access apparatus(es) in accordance with the determination; and means for n o t i f y i n g t h e second management apparatus o f an access apparatus(es) that has undergone a change of t h e operation modes r e l a t i n g to the energy consumption.

3. The communication system according to claim 2, wherein t h e second management a p p a r a t u s c o m p r i s e s : means for determining a packet forwarding apparatus(es) that is caused to undergo a change of the operation modes relating t o the energy consumption based on a n a c c e s s apparatus(es) t h a t t h e second management apparatus has been n o t i f i e d of by t h e f i r s t management apparatus and t h a t has undergone a change o f t h e operation modes relating to the energy consumption; and means f o r changing t h e operation modes r e l a t i n g t o the energy consumption of the packet forwarding apparatus(es) in accordance with the determination.

4. The communication system according to any o n e o f claims 1 to wherein the second management apparatus f u r t h e r comprises range determination means for determining an operation mode change 5 range of t h e packet forwarding apparatus(es) that is caused to undergo the operation modes.

5. A f i r s t management a p p a r a t u s , arranged in a communication system comprising an access apparatus(es) accessed by communication terminals and a packet forwarding apparatus(es) forwarding packets via t h e access 5 apparatus(es), and c o n t r o l l i n g operation modes r e l a t i n g to energy consumption of the access apparatus(es), and causing a second management a p p a r a t u s t o c o n t r o l operation modes r e l a t i n g to energy consumption o f t h e packet forwarding 10 apparatus(es) based on a change o f t h e o p e r a t i o n modes r e l a t i n g to the energy consumption of the access apparatus(es).

6. A second management a p p a r a t u s , arranged i n a communication system comprising an access apparatus(es) accessed by communication t e r m i n a l s , a packet forwarding apparatus(es) forwarding packets v i a t h e access 5 apparatus(es), and a f i r s t management a p p a r a t u s c o n t r o l l i n g operation modes r e l a t i n g to energy consumption of the access apparatus(es), and c o n t r o l l i n g operation modes r e l a t i n g to energy consumption of the packet forwarding apparatus(es) based on a change o f t h e operation modes r e l a t i n g to t h e energy consumption of the access apparatus.

7. The second management a p p a r a t u s a c c o r d i n g t o claim 6, comprising: means f o r d e t e r m i n i n g a packet forwarding apparatus(es) t h a t i s caused to undergo a change of t h e operation modes relating to the 5 energy consumption based on an access apparatus(es) that the.second management apparatus has been n o t i f i e d of by the f i r s t management apparatus and t h a t has undergone a change of t h e operation modes relating t o t h e energy consumption; and means f o r changing the operation modes r e l a t i n g to the energy consumption o f t h e packet forwarding apparatus(es) in accordance with t h e determination.

8. The second management a p p a r a t u s a c c o r d i n g t o c l a i m 6 or 7, f u r t h e r comprising: range determination means f o r determining an operation mode change range o f t h e packet forwarding apparatus(es) t h a t i s caused to undergo the operation modes.

9. A control method o f o p e r a t i o n modes o f a n a c c e s s apparatus(es) accessed by communication terminals and of a packet forwarding apparatus(es) forwarding packets via t h e access apparatus(es) included in a communication s y s t e m , t h e c o n t r o l method comprising s t e p s of: controlling o p e r a t i o n modes r e l a t i n g to energy consumption of the access apparatus(es); and controlling operation modes r e l a t i n g to energy consumption of the packet forwarding apparatus(es) based on a change of t h e operation modes r e l a t i n g to t h e energy consumption of t h e a c c e s s apparatus(es).

10. A program, causing a computer managing an access apparatus(es) accessed by communication terminals and a packet forwarding apparatus(es) forwarding packets via the access apparatus(es) included i n a communication system to execute processes o f : controlling operation modes r e l a t i n g to energy consumption of the access apparatus(es); and controlling o p e r a t i o n modes relating to energy consumption of the packet forwarding apparatus(es) based on a change of t h e operation modes r e l a t i n g t o t h e energy consumption o f the access apparatus(es).

WE CLAIM:
1. A communication system, comprising:
an access apparatus(es) accessed by communication t e r m i n a l s ;
a packet forwarding apparatus(es) forwarding packets via the
access apparatus(es);
a f i r s t management a p p a r a t u s c o n t r o l l i n g operation modes
relating to energy consumption of the access apparatus(es); and
a second management a p p a r a t u s c o n t r o l l i n g operation modes
relating to energy consumption of t h e packet forwarding apparatus(es)
based on a change of the operation modes r e l a t i n g t o the energy
consumption of t h e access apparatus(es).
2. The communication system according t o c l a i m 1,
wherein t h e f i r s t management apparatus comprises:
means for determining whether t o change t h e operation modes
relating to the energy consumption of the access apparatus(es) based
o n a s t a t e o f t h e access apparatus(es);
means for changing t h e operation modes relating to the energy
consumption of t h e access apparatus(es) in accordance with the
determination; and
means for n o t i f y i n g t h e second management apparatus o f an
access apparatus(es) that has undergone a change of t h e operation
modes r e l a t i n g to the energy consumption.
3. The communication system according to claim 2,
wherein t h e second management a p p a r a t u s c o m p r i s e s :
means for determining a packet forwarding apparatus(es) that is
caused to undergo a change of the operation modes relating t o the
energy consumption based on a n a c c e s s apparatus(es) t h a t t h e second
management apparatus has been n o t i f i e d of by t h e f i r s t management
apparatus and t h a t has undergone a change o f t h e operation modes
relating to the energy consumption; and
means f o r changing t h e operation modes r e l a t i n g t o the energy
consumption of the packet forwarding apparatus(es) in accordance
with the determination.
4. The communication system according to any o n e o f claims 1 to
wherein the second management apparatus f u r t h e r comprises
range determination means for determining an operation mode change
5 range of t h e packet forwarding apparatus(es) that is caused to undergo
the operation modes.
5. A f i r s t management a p p a r a t u s ,
arranged in a communication system comprising an access
apparatus(es) accessed by communication terminals and a packet
forwarding apparatus(es) forwarding packets via t h e access
5 apparatus(es), and
c o n t r o l l i n g operation modes r e l a t i n g to energy consumption of
the access apparatus(es), and
causing a second management a p p a r a t u s t o c o n t r o l operation
modes r e l a t i n g to energy consumption o f t h e packet forwarding
10 apparatus(es) based on a change o f t h e o p e r a t i o n modes r e l a t i n g to the
energy consumption of the access apparatus(es).
6. A second management a p p a r a t u s ,
arranged i n a communication system comprising an access
apparatus(es) accessed by communication t e r m i n a l s , a packet
forwarding apparatus(es) forwarding packets v i a t h e access
5 apparatus(es), and a f i r s t management a p p a r a t u s c o n t r o l l i n g operation
modes r e l a t i n g to energy consumption of the access apparatus(es), and
c o n t r o l l i n g operation modes r e l a t i n g to energy consumption of
the packet forwarding apparatus(es) based on a change o f t h e operation
modes r e l a t i n g to t h e energy consumption of the access apparatus.
7. The second management a p p a r a t u s a c c o r d i n g t o claim 6,
comprising:
means f o r d e t e r m i n i n g a packet forwarding apparatus(es) t h a t i s
caused to undergo a change of t h e operation modes relating to the
5 energy consumption based on an access apparatus(es) that the.second
management apparatus has been n o t i f i e d of by the f i r s t management
apparatus and t h a t has undergone a change of t h e operation modes
relating t o t h e energy consumption; and
means f o r changing the operation modes r e l a t i n g to the energy
consumption o f t h e packet forwarding apparatus(es) in accordance
with t h e determination.
8. The second management a p p a r a t u s a c c o r d i n g t o c l a i m 6 or 7,
f u r t h e r comprising:
range determination means f o r determining an operation mode
change range o f t h e packet forwarding apparatus(es) t h a t i s caused to
undergo the operation modes.
9. A control method o f o p e r a t i o n modes o f a n a c c e s s apparatus(es)
accessed by communication terminals and of a packet forwarding
apparatus(es) forwarding packets via t h e access apparatus(es) included
in a communication s y s t e m , t h e c o n t r o l method comprising s t e p s of:
controlling o p e r a t i o n modes r e l a t i n g to energy consumption of
the access apparatus(es); and
controlling operation modes r e l a t i n g to energy consumption of
the packet forwarding apparatus(es) based on a change of t h e operation
modes r e l a t i n g to t h e energy consumption of t h e a c c e s s apparatus(es).
10. A program, causing a computer managing an access
apparatus(es) accessed by communication terminals and a packet
forwarding apparatus(es) forwarding packets via the access
apparatus(es) included i n a communication system to execute
processes o f :
controlling operation modes r e l a t i n g to energy consumption of
the access apparatus(es); and
controlling o p e r a t i o n modes relating to energy consumption of
the packet forwarding apparatus(es) based on a change of t h e operation
modes r e l a t i n g t o t h e energy consumption o f the access apparatus(es).