A computer-implemented image processing method, comprising: acquiring (S 102) original signal data indicating an intensity distribution of signal light from each position in three-dimensional space including a cultured embryo obtained by optical coherence tomography imaging; and generating and outputting a two-dimensional map indicating an intensity distribution in a spherical coordinate space based on the original signal data, characterized in that the generating and outputting step includes: generating spherical coordinate data based on the original signal data, the spherical coordinate data indicating a relationship between each position in the three-dimensional space represented using spherical coordinates having an origin set inside the embryo and the intensity of the signal light from the position; and determining the intensity distribution in the spherical coordinate space of signal light as viewed in each moving radius direction from the origin based on the spherical coordinate data; deriving index values indicating the intensity distributions in the spherical coordinate space quantitatively in corresponding moving radius directions as scalar quantities; and outputting the intensity distribution of the signal light index values as a two-dimensional map based on the spherical coordinate data using two deflection angles of the spherical coordinates as coordinate axes. acquiring (S 102) original signal data indicating an intensity distribution of signal light from each position in three-dimensional space including a cultured embryo obtained by optical coherence tomography imaging; and generating and outputting a two-dimensional map indicating an intensity distribution in a spherical coordinate space based on the original signal data, characterized in that the generating and outputting step includes: generating spherical coordinate data based on the original signal data, the spherical coordinate data indicating a relationship between each position in the three-dimensional space represented using spherical coordinates having an origin set inside the embryo and the intensity of the signal light from the position; and determining the intensity distribution in the spherical coordinate space of signal light as viewed in each moving radius direction from the origin based on the spherical coordinate data; deriving index values indicating the intensity distributions in the spherical coordinate space quantitatively in corresponding moving radius directions as scalar quantities; and outputting the intensity distribution of the signal light index values as a two-dimensional map based on the spherical coordinate data using two deflection angles of the spherical coordinates as coordinate axes. generating spherical coordinate data based on the original signal data, the spherical coordinate data indicating a relationship between each position in the three-dimensional space represented using spherical coordinates having an origin set inside the embryo and the intensity of the signal light from the position; and determining the intensity distribution in the spherical coordinate space of signal light as viewed in each moving radius direction from the origin based on the spherical coordinate data; deriving index values indicating the intensity distributions in the spherical coordinate space quantitatively in corresponding moving radius directions as scalar quantities; and outputting the intensity distribution of the signal light index values as a two-dimensional map based on the spherical coordinate data using two deflection angles of the spherical coordinates as coordinate axes.