An in-vehicle apparatus having a handsfree function is disclosed. The in-vehicle apparatus is connectable with multiple cellular phones at a same time using a handsfree communication protocol. When a first cellular phone and a second cellular phone of the multiple cellular phones are respectively and simultaneously in a handset communicating state and in a calling state, the in-vehicle apparatus does not display a transfer switch for the first cellular phone and displays an answer switch for the second cellular phone, the transfer switch for the first cellular phone being user operable to switch the first cellular phone from the handset communicating state into a handsfree communicating state, the answer switch for the second cellular phone being user operable to switch the second cellular phone from the calling state into the handsfree communicating state.