A server comprising: a content storage unit storing content therein; a registration unit configured to register a terminal apparatus permitted to use the content; a packet transmission unit configured, upon receiving a registration request for using the content from an unregistered terminal apparatus (300,400) via a network, to transmit a measuring packet to the unregistered terminal apparatus (300,400) via the network; a measured value check unit configured to receive, from the unregistered terminal apparatus (300,400), a response packet in response to the measuring packet, and compare a measured value with a predetermined reference measurement value, the measured value indicating a length of time from the transmission of the measuring packet to the receipt of the response packet, characterized by setting means to set a time segment value; a processing status storage unit storing therein time segment values and status notification information messages in one to one correspondence; a registration processing unit configured, if the measured value is smaller than the predetermined reference measurement value, to register the unregistered terminal apparatus (300,400) in the registration unit, and if the measured value is larger than or equal to the predetermined reference measurement value and the measured value is smailler than a reference elapsed time corresponding to the time segment value, to cause the packet transmission unit to newly transmit the measuring packet to the unregistered terminal apparatus (300,400), and register the unregistered terminal apparatus (300,400) in the registration unit if the measured value for the newly transmitted measuring packet is smaller than the predetermined reference measurement value; and a notification unit configured, when the measured value is larger than or equal to the predetermined reference measurement value, and the time elapsed from the reception of the registration request exceeds the reference elapsed time corresponding to the time segment value, to notify the unregistered terminal apparatus (300,400) of a status notification information message corresponding to the time segment value and to increase the time segment value. a content storage unit storing content therein; a registration unit configured to register a terminal apparatus permitted to use the content; a packet transmission unit configured, upon receiving a registration request for using the content from an unregistered terminal apparatus (300,400) via a network, to transmit a measuring packet to the unregistered terminal apparatus (300,400) via the network; a measured value check unit configured to receive, from the unregistered terminal apparatus (300,400), a response packet in response to the measuring packet, and compare a measured value with a predetermined reference measurement value, the measured value indicating a length of time from the transmission of the measuring packet to the receipt of the response packet, characterized by setting means to set a time segment value; a processing status storage unit storing therein time segment values and status notification information messages in one to one correspondence; a registration processing unit configured, if the measured value is smaller than the predetermined reference measurement value, to register the unregistered terminal apparatus (300,400) in the registration unit, and if the measured value is larger than or equal to the predetermined reference measurement value and the measured value is smailler than a reference elapsed time corresponding to the time segment value, to cause the packet transmission unit to newly transmit the measuring packet to the unregistered terminal apparatus (300,400), and register the unregistered terminal apparatus (300,400) in the registration unit if the measured value for the newly transmitted measuring packet is smaller than the predetermined reference measurement value; and a notification unit configured, when the measured value is larger than or equal to the predetermined reference measurement value, and the time elapsed from the reception of the registration request exceeds the reference elapsed time corresponding to the time segment value, to notify the unregistered terminal apparatus (300,400) of a status notification information message corresponding to the time segment value and to increase the time segment value.