laravel 5 show name instead of showing id

I have 2 table department and student in laravel 5 framework.i want to do the following program:when i input one department name like CSE OR EEE, then the student form automatic got the department name which student form contain name, gpa, roll, department name(this department field automatic selected when i put department name in the first department table).then after fill up the student form then all form data show in the view page but in the view page the department section show department name in department field with other name, gpa, roll field.please anybody give a solution as soon as possible.

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