Abstract: A speech communication device includes a data receiver that receives data from other device. The received data is stored in a buffer. The amount of the data in the buffer is monitored at a predetermined timing. When the amount of data in the buffer exceeds a steady delay threshold, an action determining unit instructs reduction in the stored data, reduction of an initial storage amount, and reduction of an upper limit threshold (a substantial buffer capacity).

Abstract: A network monitor center monitors states of a switch such as an M/C, EPON or the like, a router/sw, etc. that configure a network, and transmits a result of monitoring to a Web portal server; the Web portal server indicates, based on the result of the monitoring by the network monitor center, a content distribution server to change a resolution rate; and a charge center imposes a charge based on a result of having changed the resolution rate.