IN-VEHICLE COMMUNICATION SUPPORT SYSTEM

Provided is an "in-vehicle communication support system" that improves an SN ratio of a speech voice output from a speaker with a relatively efficient configuration.A right seat processing unit (11) includes, assuming that a voice of a user in a right front seat is a right front seat voice, a filter HR (111) that converts the right front seat voice being output from a left front seat microphone (PL) disposed on a headrest of a left front seat into the right front seat voice collected by a right seat virtual microphone (PVR) that is a virtual microphone located on a left side of a headrest of the right front seat, a delay unit Z-TR (112) that delays and outputs an output from a right front seat microphone (PR) located on a right side of the headrest of the right front seat, a filter WRA (113) that extracts the right front seat voice being output from the filter HR (111), a filter WRB (114) that extracts the right front seat voice being output from the delay unit Z-TR (112), and a right adder (115) that adds outputs of the filter WRA (113) and the filter WRB (114) and outputs an added output as a right front seat speech voice signal (SR).