A cyclocomputer includes: a body; a display provided on an upper surface of the body and displaying prescribed information; a storage provided in the body and storing therein data including at least a portion of the prescribed information; and an NFC tag provided in the body and allowing data communication with an NFC reader writer incorporated in a mobile wireless communication terminal. The cyclocomputer can transmit via the NFC tag to the mobile wireless communication terminal at least a portion of the data stored in the storage, and the cyclocomputer can receive from the mobile wireless communication terminal via the NFC tag at least a portion of other data stored in the mobile wireless communication terminal or input to the mobile wireless communication terminal via an operation unit of the mobile wireless communication terminal.