An example information delivering device includes a conversation relaying section for relaying conversation data between users of two or more information terminals. The conversation data corresponds to a conversation between the respective users of the information terminals. An additional information delivering section adds audio data such as advertisements and music to the conversation data so that the audio data and the conversation data can be reproduced simultaneously by one or more of the information terminals, while the conversation relaying section relays the conversation data between the information terminals. This allows the information delivering device to deliver additional information such as advertisements and music during a telephone conversation.