上（に）On top of; moreover
上に adds a second fact or quality on top of the first. It often corresponds to “on top of that,” “in addition,” or “what is more.”
How the facts are stacked
The clause before 上に gives the first fact. The rest of the sentence then adds another fact that contributes to the same overall point.
Clear cumulative praise and criticism
The clearest and most common examples point in the same direction: two advantages, two problems, or two circumstances supporting one judgment.
Do both facts have to match?
Two positive facts or two negative facts are the safest default. Mixed facts are also possible when the context makes it clear why both are being accumulated, but the sentence should still lead toward one coherent practical or evaluative point.
Practical circumstances
今日は雨が降っている上に、風も強いので、試合は延期された。
It is raining today, and the wind is strong as well, so the match was postponed.
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彼は経験が豊富な上に、説明もわかりやすい。
He has extensive experience, and on top of that, his explanations are easy to understand.
Analyzeこの地域は交通が便利である上、家賃も比較的安い。
This area has convenient transportation, and the rent is relatively low as well.
Analyze彼女は医師である上に、地域の保健活動にも詳しい。
She is a doctor, and she is also knowledgeable about local public health work.
Analyze道に迷った上に、財布までなくしてしまった。
On top of getting lost, I even lost my wallet.
Analyze予約が取れない上に、当日券も販売されない。
Reservations are unavailable, and same-day tickets will not be sold either.
Analyzeこの店は料理がおいしい上、店員の対応も丁寧だ。
The food at this restaurant is delicious, and the staff are attentive as well.
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