A communication apparatus comprising: a first circuit portion comprising: connection means to which an external telephone is connectable; switching means for switching between a connection state in which the connection means is connected to a line which is connected to a VOIP adapter and a disconnection state in which the connection means is disconnected from the line, thereby enabling an external telephone to be connected to or disconnected from the line respectively; and detection means for detecting an off-hook state of the external telephone, and a second circuit portion comprising: network control means for controlling a capture state of the line, wherein: the first circuit portion is connected to the line in parallel to the second circuit portion, characterized in that the communication apparatus further comprises: first capture control means for controlling, when the detection means detects the off-hook state of an external telephone and the switching means is in the disconnection state, capture of the line using first line capture means, wherein an impedance of a side of the first line capture means is lower than an impedance of the external telephone side and wherein the first line capture means is included in the network control means; connection control means for controlling, after the first line capture means captures the line, the switching means to switch to the connection state so that the connection means is connected to the line; second capture control means for controlling capture of the line by switching to a second line capture means, wherein an impedance of a side of the second line capture means is higher than the impedance of the side of the first line capture means and wherein the second line capture means is included in the network control means; and line release means for controlling the release of the capture state of the line by the second line capture means after the second line capture means captures the line. a first circuit portion comprising: connection means to which an external telephone is connectable; switching means for switching between a connection state in which the connection means is connected to a line which is connected to a VOIP adapter and a disconnection state in which the connection means is disconnected from the line, thereby enabling an external telephone to be connected to or disconnected from the line respectively; and detection means for detecting an off-hook state of the external telephone, and connection means to which an external telephone is connectable; switching means for switching between a connection state in which the connection means is connected to a line which is connected to a VOIP adapter and a disconnection state in which the connection means is disconnected from the line, thereby enabling an external telephone to be connected to or disconnected from the line respectively; and detection means for detecting an off-hook state of the external telephone, and a second circuit portion comprising: network control means for controlling a capture state of the line, network control means for controlling a capture state of the line, the first circuit portion is connected to the line in parallel to the second circuit portion, characterized in that the communication apparatus further comprises: first capture control means for controlling, when the detection means detects the off-hook state of an external telephone and the switching means is in the disconnection state, capture of the line using first line capture means, wherein an impedance of a side of the first line capture means is lower than an impedance of the external telephone side and wherein the first line capture means is included in the network control means; connection control means for controlling, after the first line capture means captures the line, the switching means to switch to the connection state so that the connection means is connected to the line; second capture control means for controlling capture of the line by switching to a second line capture means, wherein an impedance of a side of the second line capture means is higher than the impedance of the side of the first line capture means and wherein the second line capture means is included in the network control means; and line release means for controlling the release of the capture state of the line by the second line capture means after the second line capture means captures the line. first capture control means for controlling, when the detection means detects the off-hook state of an external telephone and the switching means is in the disconnection state, capture of the line using first line capture means, wherein an impedance of a side of the first line capture means is lower than an impedance of the external telephone side and wherein the first line capture means is included in the network control means; connection control means for controlling, after the first line capture means captures the line, the switching means to switch to the connection state so that the connection means is connected to the line; second capture control means for controlling capture of the line by switching to a second line capture means, wherein an impedance of a side of the second line capture means is higher than the impedance of the side of the first line capture means and wherein the second line capture means is included in the network control means; and line release means for controlling the release of the capture state of the line by the second line capture means after the second line capture means captures the line.