Canon PowerShot V10 Advanced User's Manual page 136

Rating All Images in a Folder or on a Card
You can rate all the images in a folder or on a card at once.
Under [ : Rating], when you select [All images in folder] or [All images on card], all
the images in the folder or on the card will be rated.
Press the <
When you are not rating images or canceling the rating, select [
Note
Values next to rating marks are displayed as [###] if more than 1,000 images have
that rating.
> < > keys to select a rating, then select [OK].
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