In my game i want to show score in 3d text like the one shown in image, can anyone guide me how to do this.
You will need 3D meshes for your numbers. Most modeling programs will allow you to extrude text. Then, unless you use a fixed pitch font, you will need the alignment table from the font (or create your own for just a limited number of characters) in order to get the layout to look right. Note if you search for ‘Unity 3D Text extrude’, you will find some posts on this subject. Doing it dynamically from either a bitmap, or from the TTF file would be a bunch of work, but possible.
Edit: Or you can purchase the package that you borrowed the image you are using in your question.
For free user, you may use “RealWorld Icon Editor”. You can create your 3D text and export it as .3ds object.