The median is the middle number in a set of numbers when they are arranged in ascending or descending order.
Step 1: Arrange the numbers in ascending order:
\[
6, 7, 8, 14, 18
\]
Step 2: The middle number is 8, so the median is 8.
Thus, the median of the numbers 18, 14, 6, 7, 8 is \( 8 \).