Next time, put a question like this in Mechanics.

Since there are no spacers above the stem, the current stem can't be raised. It also looks like the stem comes straight out from the steerer or angles up slightly, which means it can't be flipped to raise the bars, either.

Here are some options:
- Higher angle stem
- Higher rise handlebars
- Stem raiser http://www.amazon.com/STEM-RAISER-DE.../dp/B001D025OA
- Some combo of the above

Raising the bars may make the cable housings too short. They look like they're about as short as they can go now, so it's likely.

Here's a handy tool to compare how various stems will affect handlebar height: http://alex.phred.org/stemchart/Default.aspx