A contents reproduction apparatus has a contents buffer, a contents reproduction unit, a navigation function unit that provides guide in a route to a destination, an output switching unit that selects first audio data outputted from the contents reproduction unit or second audio data outputted from the navigation function unit and outputs the selected audio data to outside, and a streaming control unit that sets a buffer size that is a target value of the data amount of contents data to be accumulated in the contents buffer and controls the contents reproduction unit and the output switching unit. When the data amount of contents data accumulated in the contents buffer is less than the buffer size, a reproduction operation of the contents reproduction unit is stopped in a period in which the second audio data are outputted to outside.