US Patent 9619440 Document conversion apparatus

A document conversion apparatus includes an obtaining unit configured to obtain document data in a first file format including first character font information; and a conversion unit configured to convert the obtained document data into document data in a second file format that is different from the first file format using second character font information that is different from the first character font information, wherein the conversion unit includes alternative information, showing that the second character font information is an alternative of the first character font information, in the document data in the second file format.