An earphone includes a communication interface capable of performing data communication with an own user terminal communicably connected to at least one another user terminal via a network, a first microphone configured to collect a speech voice of at least one another user located near the user during a conference, a buffer configured to accumulate collected audio data of the speech voice of the other user, which is collected by the first microphone, and a signal processing unit configured to execute, by using audio-processed data of the other user speech voice transmitted from the other user terminal to the own user terminal via the network during the conference and the collected audio data accumulated in the buffer, cancellation processing for canceling a component of the speech voice of the other user included in the audio-processed data.