To efficiently perform echo control from the beginning by preliminarily storing a parameter value that matches the picture conference system environment of a conference room, calculating an adaptive filter coefficient that is appropriate at the beginning by using the parameter and performing echo control.

A control part 32 reads a parameter value from memory 34 which stores parameter values (a remote input signal, a near input signal and a predictive echo signal) which match a picture conference system environment of a conference room and flows it to an echo controlling part 30. The part 30 calculates an initial value adaptive filter coefficient based on that and performs control. When a conference starts, the part 30 calculates a filter coefficient based on an echo signal that is caused by a remote input signal which is inputted by the part 32 and transmitted from the other conference halls, a near signal of this conference hall and a predictive echo signal and performs control that matches an actual. state. After a prescribed time passes, the part 32 stores the current parameter value in the memory 34.