A conversation support system suitable to be mounted in an automobile to support conversation of passengers in an automobile, seats of at least two or more rows being placed in the automobile, wherein to each of the seats corresponds a loudspeaker and a microphone, the conversation support system comprising: a speech switching control part configured, when the conversation support system is mounted in the automobile, to designate a desired sound pickup and reproduce area based on designation by a first passenger sitting in a first seat; and a first target speech emphasizing part configured to output a signal obtained by emphasizing speech which is collected with a microphone corresponding to the designated sound pickup and reproduce area to the loud speaker corresponding to the first seat; and a second target speech emphasizing part configured to output a signal obtained by emphasizing speech, which is collected with the microphone corresponding to the first seat and which is emitted from the first seat, to a loud speaker corresponding to the sound pickup and reproduce area characterized in that in the speech switching control part, the sound pickup and reproduce area is designated with a switch placed in the automobile using a result of recognizing speech emitted by the first passenger, the conversation support system further comprises an echo canceller part, the echo canceller part is configured to update a different filter to cancel echo in each of the following cases: a case where a second passenger sitting in a second seat holds a conversation with only the first passenger sitting in the first seat, a case where the second passenger holds a conversation with only a third passenger sitting in a third seat other than the first passenger, and a case where the second passenger holds a conversation with both the first passenger and the third passenger, and the filter is updated, respectively, based on a transfer function between the loud speaker corresponding to the first seat and the microphone corresponding to the second seat, a transfer function between the loud speaker corresponding to the third seat and the microphone corresponding to the second seat, and a transfer function obtained by adding both of the transfer functions. a speech switching control part configured, when the conversation support system is mounted in the automobile, to designate a desired sound pickup and reproduce area based on designation by a first passenger sitting in a first seat; and a first target speech emphasizing part configured to output a signal obtained by emphasizing speech which is collected with a microphone corresponding to the designated sound pickup and reproduce area to the loud speaker corresponding to the first seat; and a second target speech emphasizing part configured to output a signal obtained by emphasizing speech, which is collected with the microphone corresponding to the first seat and which is emitted from the first seat, to a loud speaker corresponding to the sound pickup and reproduce area characterized in that in the speech switching control part, the sound pickup and reproduce area is designated with a switch placed in the automobile using a result of recognizing speech emitted by the first passenger, the conversation support system further comprises an echo canceller part, the echo canceller part is configured to update a different filter to cancel echo in each of the following cases: a case where a second passenger sitting in a second seat holds a conversation with only the first passenger sitting in the first seat, a case where the second passenger holds a conversation with only a third passenger sitting in a third seat other than the first passenger, and a case where the second passenger holds a conversation with both the first passenger and the third passenger, and the filter is updated, respectively, based on a transfer function between the loud speaker corresponding to the first seat and the microphone corresponding to the second seat, a transfer function between the loud speaker corresponding to the third seat and the microphone corresponding to the second seat, and a transfer function obtained by adding both of the transfer functions.