A 
voice data creation 
system includes a dictionary 
data memory section that stores dictionary data for generating synthesized 
voice data corresponding to text data; an edition 
processing section that displays an edition screen for editing a voice guidance message as a 
sentence including a plurality of phrases to receive edition input formation so as to perform an edition 
processing based on the edition input information; a 
list information generation 
processing section that generates 
list information relating to each 
sentence and phrases included in the each 
sentence based on a result of the edition processing; a 
phrase voice data generating section that determines a target 
phrase for voice data creation based on the 
list information to generate and maintain voice data corresponding to the target 
phrase determined for voice data creation based on the dictionary data; and a memory write information generating section that determines a target phrase to be stored in a voice 
data memory based on the list information to generate memory write information including voice data of the target phrase determined to be stored in the memory. In the 
system, the edition processing section divides a sentence input on the edition screen into a plurality of phrases based on text data of the sentence input; the list information generation processing section specifies the phrases included in the sentence and a 
reproduction order of the phrases based on a result of the sentence division to generate sentence information including phrase specification information of the phrases included in the sentence and sequence information relating to the 
reproduction order of the phrases; the phrase voice data generating section generates synthesized voice data corresponding to text data of the target phrase for voice data creation based on the dictionary data; and the memory write information generating section determines the target phrase to be stored in the memory such that voice data of a phrase used commonly in a plurality of sentences and a phrase used a plurality of number of times in a 
single sentence are not duplicately stored.