6. An information processing method comprising the steps of: using a computer to perform the steps of: reading a property of document data; displaying a notice to enter a default language representing language information entered with respect to a property key of the read property; identifying a language used in the document data; identifying a language used in a property value of the read property entered with respect to the document data; registering information on the entered default language in association with the property value and the property key of the read property;, and translating the property value entered with respect to the document data from the language used in the property value into the language used in the document data when the language used in the property value is different from the language used in the document data.
6. An information processing method comprising the steps of: using a computer to perform the steps of: reading a property of document data; displaying a notice to enter a default language representing language information entered with respect to a property key of the read property; identifying a language used in the document data; identifying a language used in a property value of the read property entered with respect to the document data; registering information on the entered default language in association with the property value and the property key of the read property;, and translating the property value entered with respect to the document data from the language used in the property value into the language used in the document data when the language used in the property value is different from the language used in the document data. 7. The information processing method according to claim 6 , wherein the property value entered with respect to the document data is translated by said computer from the language used in the property value into each of a plurality of languages used in the document data when the plurality of languages are identified in the document data.