Communication device, connection method and storage medium

1. A communication device comprising:

an access point unit which is configured to connect a wireless terminal with at least one of a lower network and an upper network;

a filtering disabling unit configured to disable filtering, which prevents connecting with an unregistered wireless terminal whose unique ID is not registered a filter list;

a unique ID registration unit which is configured to acquire the unique ID of the wireless terminal and to register the acquired unique ID in the filter list if a connection request is received from the wireless terminal and filtering is disabled: and

a filtering enabling unit which is configured to enable filtering after the unique ID of the wireless terminal is registered in the filter list: and

a communication area reduction unit which is configured to reduce a communication area in which the wireless terminal is configured to communicate when filtering is disabled, as compared to when filtering is enabled.

2. The communication device according to claim 1 , wherein the communication area reduction unit is configured to lower an output level of a radio wave as compared to when filtering is enabled, upon filtering being disabled.

3. The communication device according to claim 1 , further comprising:

a connection time restriction unit which is configuered to enable filtering when no connection request is received from the wireless terminal during a predetermined period after filtering is disabled.

4. The communication device according to claim 1 , further comprising:

a connection guide unit which is configured to display a procedure of connection on a screen.

5. A communication device comprising:

access point means for connecting a wireless terminal with at least one of a lower network and an upper network;

filtering disabling means for disabling filtering, which prevents connecting with an unregistered wireless terminal whose unique ID is not registered in a filter list;

unique ID registration means for acquiring the unique ID of the wireless terminal and registering the acquired unique ID in the filter list if a connection request is received from the wireless terminal and filtering is disabled;

filtering enabling means for enabling filtering after the unique ID of the wireless terminal is registered in the filter list; and

communication area reduction means for reducing a communication area in which the wireless terminal is configured to communicate when filtering is disabled, as compared to when filtering is enabled.

6. A connection method, comprising:

connecting a wireless terminal with at least one of a lower network and an upper network:

disabling filtering, which prevents connecting with an unregistered wireless terminal whose unique ID is not registered in a filter list;

acquiring the unique ID of the wireless terminal and registering the acquired unique ID in the filter list if a connection request is received from the wireless terminal and filtering is disabled;

enabling the filtering aft- he unique ID of the wireless terminal is registered in the filter list; and

reducing a communication area in which the wireless terminal is configured to communicate when filtering is disabled, as compared to when filtering is enabled.

7. The connection method according to claim 6 , further comprising:

enabling filtering when no connection request is received from the wireless terminal during a predetermined period after disabling filtering.

8. A non-transitory storage medium storing a program, the program comprising:

a connection program for realizing the connection method according to claim 6 by a computer.