A card conveyance system may include a first device; a second device; a conveying passage; and a host apparatus controlling the first and second device. The first device may send a card to and receive the card from the second device via the conveying passage. The second device may receive the card from and send the card to the first device via the conveying passage. The host apparatus may include an application executing section to execute an application including a user interface; a middleware executing section to execute middleware controlling the second device and the first device corresponding to a command of a standard specification; and a synchronous control section configured to acquire a command of the standard specification and control a conveying roller of the first device and a conveying roller of the second device synchronously with conveyance of the card.