Patent ID: 8321573

Claim:
A communication terminal connected to a router that when a send request is issued, performs a transmission process in accordance with the request and temporarily releases a receive port, the communication terminal comprising: a first issuer issuing to said router a send request to request said router to send an ask signal to ask for a repetitive response to an external server; a receiver receiving a response signal from said external server through said receive port in response to the send request issued by said first issuer and a determiner determining an issuance cycle of the send request on the basis of the reception result by said receiver; wherein said response signal from said external server includes time information representative of a time elapsed from a request receiving time to a response transmitting time, the time information being attached to the response signal by said external server, and said determiner determines said issuance cycle on the basis of time information extracted from a most-recent response signal that was lastly received by said receiver.