A reproduction apparatus and method for reproducing selected digital data reproduces digital data selected by a user, detects remaining power of a battery, and determines whether the selected digital data can be reproduced to the end or not based on the detected remaining power. Before the selected digital data is reproduced, if it is determined that there is sufficient battery power to reproduce the selected digital data to the end, then the selected digital data is reproduced. If not, a warning is provided and the user selects either a first reproduction mode or a second reproduction mode. If the first reproduction mode is selected, the selected digital data is reproduced. If the second reproduction mode is selected, summary data that includes a summary of the selected digital data is reproduced.