how to add next and previous link on content full display page on tpl file in drupal 7?
You will have to write this logic yourself in a hook_preprocess_node(). This code should be added to the template.php file of your front end theme.

Here's an example:

function YOUR_THEME_preprocess_node(&amp;$variables) {
  // Perform the logic for selecting prev/next terms here. Install and use
  // the Devel module to see what is available to you and to debug the code.

  // See what's available:
  dpm($variables);

  // Load a sample term. Note: this should be different if your website is
  // in multiple languages. Below is just an example.
  $term = taxonomy_term_load($variables['node']-&gt;field_term[LANGUAGE_NONE][0]['tid']);

  // Pass a variable to the node--flower.tpl.php file. Code below will make
  // the $previous_category and $next_category variables available in the
  // node--flower.tpl.php file.
  $variables['previous_category'] = 'Your link here';
  $variables['next_category'] = 'Your link here';
}