A transport device and a transporting method. The transporting device includes a transporting unit, a plurality of medium sensing units, an encoder, a paper management module, a determining unit, and a transport controller. When the determining unit determines that a transport error has occurred in a succession transport medium based on a count value for an encoder signal, the paper management module stops counting, and the transport controller controls the transporting unit such that the transporting unit continues transporting a previous transport medium.