A content collection part compares the transmission rate (TD) inputted from a transmission rate monitoring part with a threshold value (C-.alpha.) in response to a start operation by a user. When a condition TD<(C-.alpha.) is satisfied, the content collection part starts an automatic content ...http://www.google.com.tw/patents/US6170016?utm_source=gb-gplus-share專利 US6170016 - System for selectively requesting data from a server based on prior accepted requests, transmission rate, and transmission capacity 
