A medium processing apparatus includes a medium processing mechanism that processes a medium, a first board configured to communicate with an external apparatus by a first communication method and control the medium processing mechanism, a second board configured to communicate with the first board by the first communication method, a third board configured to communicate with the second board by the first communication method and communicate with the external apparatus by a second communication method different from the first communication method, a switcher that switches a communication destination of the first board to the second board or the external apparatus, and a notification section that makes, when the communication destination of the first board is switched to the second board by the switcher, a notification of communication information based on the second communication method.