1. An imaging apparatus, comprising: a light source configured to irradiate light that is frequency swept; an interference unit configured to diverge the irradiation light into irradiation light, which is to be irradiated on an object to be inspected, and reference light, to generate coherent light from reflected light of the irradiation light from the object to be inspected and the reference light; at least two conversion units configured to subject at least two analog signals, which are obtained by diverging an analog signal of the coherent light, to analog-to-digital conversion; an association unit configured to associate indices of at least two data arrays obtained by the analog-to-digital conversion; an integration unit configured to integrate the at least two data arrays based on the associated indices; and an image generating unit configured to generate an image of the object to be inspected based on a data array obtained by the integration.