A multi-media title playing apparatus which dynamically changes play of a title according to an input by the user while the title is played has an external message receiving means for receiving a command from the outside of the apparatus and an external message interpreting means for processing the received command, in which an external application having a function to make a judgement on the basis of predetermined conditions on a user's input and send a command according to a result of the judgement to the multi-media title playing apparatus is described in a scenario.