Yes pruning will certainly help your rose - especially as pruning is essential - not only for the health of a rose but also for the number of blooms it will produce and should be done at least once every year.
When to prune is very much dependant on what climate you live in but as a general guide - roses are normally pruned in late winter, when they are in their dormant stage which is somewhere between December and February.
There are three types of pruning for rose bushes
Heavy pruning where you take the stems down to around 5" is used to rejuvenate old roses and very young ones to encourage vigorous growth.
Moderate pruning is the one that is most commonly used by all rose growers and is where you cut the whole of the rose back to half its height.
Light pruning is not recommended for any rose as it will result in a weak, spindly bush that hardly flowers and when it does has poor quality blooms.
As I mentioned before - moderate pruning is the most commonly used method by all rose growers and the one that I would recommend to you, but would also add that prior to reducing the overall size you will also need to cut out any dead wood or twiggy growth as well as any cross over stems.
By doing this you will land up with a healthy looking, abundantly flowering rose bush that is sure to be an eye catching sight throughout the year
