A wireless communication apparatus , comprising: an antenna ; an antenna shared unit ; a demodulation unit ; a modulation unit ; a display unit ; and a control unit , wherein said wireless communication apparatus is configured to receive (611; 626) from a management system , via said antenna , antenna shared unit and demodulation unit , a group addition approval request for approving a group addition request that requests an additional registration of another communication apparatus with a group consisting of a plurality of wireless communication apparatuses including said wireless communication apparatus sharing a network connection right to connect to a predetermined network via a wireless line (123,... 126) the group addition approval request including each piece of information included in said group addition request including approval method information identifying an approval method for performing a group addition approval operation; and said control unit is configured to perform (612; 627), in response to receiving said group addition approval request , said group addition approval operation; and said display unit is configured to display a screen for group addition approval in accordance with said identified approval method, whereby in case an approval method of approving the addition request by a selection operation is identified by said approval method information, the screen for group addition approval is provided with an addition request device display area , an addition approval button and an addition non-approval button , and said wireless communication apparatus is configured to transmit (613; 628) to said management system , via said modulation unit , antenna shared unit and antenna , a group addition approval result indicating whether said group addition approval request has been, in case that said addition approval button has been pressed, approved or has been, in case said addition non-approval button has been pressed, not approved. an antenna ; an antenna shared unit ; a demodulation unit ; a modulation unit ; a display unit ; and a control unit , wherein said wireless communication apparatus is configured to receive (611; 626) from a management system , via said antenna , antenna shared unit and demodulation unit , a group addition approval request for approving a group addition request that requests an additional registration of another communication apparatus with a group consisting of a plurality of wireless communication apparatuses including said wireless communication apparatus sharing a network connection right to connect to a predetermined network via a wireless line (123,... 126) the group addition approval request including each piece of information included in said group addition request including approval method information identifying an approval method for performing a group addition approval operation; and said control unit is configured to perform (612; 627), in response to receiving said group addition approval request , said group addition approval operation; and said display unit is configured to display a screen for group addition approval in accordance with said identified approval method, whereby in case an approval method of approving the addition request by a selection operation is identified by said approval method information, the screen for group addition approval is provided with an addition request device display area , an addition approval button and an addition non-approval button , and said wireless communication apparatus is configured to transmit (613; 628) to said management system , via said modulation unit , antenna shared unit and antenna , a group addition approval result indicating whether said group addition approval request has been, in case that said addition approval button has been pressed, approved or has been, in case said addition non-approval button has been pressed, not approved. <EOS>