HANDS-FREE DEVICE, HANDS-FREE SYSTEM, AND DATA TRANSFER METHOD

A hands-free device enables a hands-free call by being wirelessly connected to a mobile phone. The hands-free device incudes a hardware processor configured to: perform a control related to data transfer using a transfer protocol for implementing transfer of history data including incoming call history data and outgoing call history data, and phone book data stored in the mobile phone when the mobile phone is in a wireless connection area; receive the history data and the phone book data from the mobile phone through communication using the transfer protocol; and store the history data and the phone book data that are received. The hardware processor is configured to perform the control to transfer the history data prior to the phone book data.