Many works have been done to make a database of sound sources' radiation patterns, such as musical instruments. However, the conventional approaches were mainly based on the farfield measurement at some selected points on the spherical surface. A huge amount of data was presented in every spherical coordinate's angular direction. To overcome the problem, a method based on the equivalent source method(ESM) is proposed to record and exchange information on the spatial radiation characteristics from a sound source. By utilizing the principle of acoustical holography, complicated radiation patterns and strengths of an actual source can be approximately described by expanding the spherical harmonics in various orders. Such a method enables preserving the radiation pattern information of sound sources keeping only details on the position coordinate of equivalent sources and the coefficient of each order of spherical harmonics, which can be regarded as a standard format. If the proposed approach is used, a more precise and large amount of information can be stored with a smaller size of data than the conventional dataset.