roguinrireki to tanmatuitiran wo kuraberu.

They do different jobs.

• と links the two things being compared:
  • ログイン履歴 と 端末一覧
  • login history and device list
• を marks the whole compared set as the object of 比べる:
  • ログイン履歴と端末一覧を比べる
  • compare the login history and device list

With 比べる, it is very common to say AとBを比べる for compare A and B.

Because ログイン履歴と端末一覧 acts as one combined object.

So the structure is:

• [A と B] を 比べる

not

• A を B を 比べる ← incorrect

The particle と first connects the two nouns, and then を marks that whole phrase as the thing being compared.

比べる means to compare.

In this sentence, it means checking the two things against each other to see how they match or differ. In a technical or app context, it can imply things like:

• checking for differences
• checking whether entries correspond
• matching one list against another

So it is not just abstract comparison; it can also suggest a practical side-by-side check.

The dictionary form is very common in short written Japanese, especially in:

• menu items
• button labels
• instructions
• headings
• notes
• neutral written descriptions

So ログイン履歴と端末一覧を比べる can sound like:

• a simple action label
• a written instruction
• a feature name

If you were saying it politely in a full sentence, you might use 比べます. But for UI text or brief instructions, the plain form is very natural.

Yes, from an English point of view, the subject is omitted.

Japanese often leaves out the subject when it is obvious from context. Depending on the situation, this could mean:

• Compare the login history and device list
• I compare the login history and device list
• You should compare the login history and device list

In interface text or instructions, it often feels like an imperative-style label or a neutral action description, rather than a full spoken sentence with an explicit subject.

The usual readings are:

• ログイン履歴 → ログインりれき
• 端末一覧 → たんまついちらん
• 比べる → くらべる

A full reading would be:

• ログインりれき と たんまついちらん を くらべる

Notes:

• ログイン is a katakana loanword from login
• 履歴 means history/record
• 端末 means device/terminal
• 一覧 means list/overview

No, normal Japanese usually does not use spaces like this:

• natural writing: ログイン履歴と端末一覧を比べる。

The spaces here are probably added for learners to make the structure easier to see. That is very common in teaching materials.

So the spaced version is helpful for study, but the unspaced version is what you would normally see in real Japanese text.

と gives a complete, definite pairing: A and B.

• ログイン履歴と端末一覧
  • the login history and the device list

や is used more for an incomplete or representative list, like A, B, and so on.

Since this sentence is comparing two specific things, と is the natural choice.

Yes, that is also grammatical.

• ログイン履歴と端末一覧を比べる
• ログイン履歴を端末一覧と比べる

Both can mean compare the login history and the device list.

The second version slightly highlights ログイン履歴 as the main thing being compared with the device list. The original version sounds more balanced, treating both items as a pair.

In many practical contexts, the original AとBを比べる is the most straightforward way to say it.

Grammatically, yes, it can function as a complete sentence in Japanese. But in real usage, it may feel a little clipped or context-dependent.

For example, it could be:

• a dictionary-form sentence
• a heading
• a note
• a menu action
• an instruction label

In English, we often expect a fuller sentence with a subject, but Japanese often allows this kind of compact phrasing.

一覧 means something like:

• list
• overview
• summary display

So 端末一覧 is not just any mention of devices; it suggests a structured list or screen showing device entries.

In a tech context, 一覧 often appears in UI labels such as:

• user list
• error list
• file list
• device list

It has a practical, organized, interface-like nuance.

Both are nouns.

More specifically, they are compound nouns:

• ログイン + 履歴
• 端末 + 一覧

Japanese often combines nouns this way, especially in technical or administrative language. That is why the sentence can stay very compact:

• noun + と
  • noun + を
    • verb

This style is especially common in manuals, apps, and system messages.