1 INTRODUCTION

2 PHOTOMETRIC DATA

3 ANALYSIS
3.1 Magnitude System
3.2 Cross-Filter K-correction
3.3 Uncertainty of the Analysis

4 OBSERVATIONAL BIAS OF THE SDSS SAMPLE
4.1 Selection Bias of the SDSS Sample
4.2 Contamination of other type SNe

5 RESULTS
5.1 Photometric Properties of the SDSS sample
5.2 Photometric Properties of Host Galaxies

6 DISCUSSION
6.1 Diversity of Photometric Properties of SNe Ia
6.2 Extinction Law of Host Galaxy Dust
6.3 Other factors which may have affected the observed SNe Ia colours
6.4 Implications for cosmology

7 SUMMARY