What it means
上に means “on top of that” or “in addition to,” adding a second fact to the first. The two facts are usually related and point in the same direction, such as two advantages or two problems. It commonly follows a plain form, and it is somewhat more formal and written than simple additive expressions such as それに.
Usage note
This additive 上に is different from the physical-location expression meaning “on top of,” as in a noun followed by の上に. With a noun, the additive pattern normally uses である上に; with a na-adjective, it uses な上に.
How to use it
彼は医者である上に、料理も上手です。
He is a doctor, and in addition, he is good at cooking.
この部屋は静かな上に、日当たりもよいです。
This room is quiet, and in addition, it gets good sunlight.
このかばんは軽い上に、丈夫です。
This bag is light, and in addition, it is sturdy.
この薬は効く上に、副作用も少ないです。
This medicine is effective, and in addition, it has few side effects.
彼は医者である上に、料理も上手だ。
He is a doctor, and in addition, he is good at cooking.
この部屋は静かな上に、日当たりもよい。
This room is quiet, and in addition, it gets good sunlight.
このかばんは軽い上に、丈夫だ。
This bag is light, and in addition, it is sturdy.
この薬は効く上に、副作用も少ない。
This medicine is effective, and in addition, it has few side effects.