Hi Yusuke,
Can you tell us the full name of the model (cgf) file and the folder structure that it is in ... as well as the name of the material (mtl) file and the folder that it is in ... as well as the name of the texture generated (tiff) and the folder it is in.
Then, finally, post the text from the mtl file here.
From the name of the cgf you have many many levels components nested within each other ... another things to try is to explode everything until you just have one component (do this carefully so you don't miss any sub components) and then apply one material to it all.
Cheers