> I have a friend who has the same table. He tried sanding the table top, but it didn't work for him to re-stain it.
Why did it not work for your friend? Did he/she sand too aggressively? I suspect it's a veneered top, so with delicate sanding, it should be amenable to refinishing.
Before you do anything, get some lacquer thinner or acetone (finger nail polish remover, if you have some acetone polish remover) and put a drop on an area, rub it in, see if the finish melts within 20-30 seconds. If it melts, then the finish is lacquer. If it's a lacquer finish, then removing it will be easier than removing a different finish.
Are you sure the top is stained? To me, it looks like just a clear coat has been applied. With the grain pattern as showy as it is, no need for a stain. As to those whitish or faded spots, it appears to me that the wood may not be stained, but the clear coat that was applied has been tinted. Looks like the clear coat's tinting has faded or rubbed out (or off) in those spots. If its present top coat has been rubbed off that easily, then the top coat may not be so thick, thickly applied, hence more easily removed.
You can likely successfully strip it with a chemical stripper, lightly sand with 220 grit sand paper and refinish with a clear coat, tinted or not.